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Alternanthera mosaic potexvirus: Several Features, Properties, and Application.

1. Introduction

Alternanthera mosaic virus (AltMV) was first described in 1999 as "isolate 451/1" in the state of Queensland, Australia [1]. The new virus was isolated from Alternanthera pungens plants of the family Amaranthaceae. AltMV belongs to the genus Potexvirus and the family Alphaflexiviridae. The AltMV genome is a positive-sense single-stranded RNA 6604-6607 nt long depending on the isolates. AltMV virions represent flexible filamentous particles with helical symmetry made up of one type of coat protein (CP) subunits. The mean length of AltMV virions equals 554 nm [1], 536 nm [2], or 570 nm [3]. As reported by Mukhamedzhanova et al. [3], the virions are 13 nm in diameter. Recently AltMV virion diameter was corrected to 13.5 nm by means of cryoelectron microscopy [4].

Since plant viruses and virus-like particles (VLPs) are essentially safe for humans they seem promising for technological advances in a broad range of areas from microelectronics to developing candidate vaccines and adjuvants [5, 6]. AltMV virions and VLPs have a considerable number of advantages for successful application in biotechnology [4, 7-9].

2. AltMV Isolates and Their Distribution

Soon after AltMV had been discovered in Australia, other isolates were derived from plants in Europe [10,11], USA [2,12-16], Brazil [17], and Asia [18]. Nowadays AltMV is reported to be spread all over the world, and capable of infecting plants of various families including ornamental plants and crops [1, 19]. To date, complete nucleotide sequences are determined for the following AltMV isolates: AltMV-Ac (6604 nt long), AltMV-MU (6606 nt), and AltMV-PA (6607 nt). Four biologically active cDNA of "infectious clones" (3-1, 3-7, 4-1, and 4-7) were derived from AltMV-SP genome; the complete nucleotide sequences of these clones were established (6607 nt). The nucleotide sequences of the other isolates have been only partially determined [2,14, 20].

The diversity of the obtained isolates both in terms of the host plants being the targets for virulence and geographical distribution implies the existence of phylogenetically diverged groups within the AltMV taxon [11, 20]. Based on amino acid sequences of RNA-dependent RNA polymerase (RdRp, replicase) and CP, Ivanov et al. [11] have distinguished 2 groups within the AltMV species: phlox-like isolates and portulaca-like isolates. In the studyby Hammond and Reinsel [20] this differentiation was confirmed by means of amino acid sequence analysis of the three proteins which are products of the "triple gene block" (TGB). Apparently, Asian AltMV isolate should be regarded as a separate group [18].

AltMV-IT, AltMV-MU, AltMV-Port, AltMV-Po, AltMVCIN, and AltMV-PLR (Table 1) were classified as portulacalike isolates [20]. Ivanov et al. [11] indicated a close evolutionary relationship among the isolates of this group. The amino acid sequences of AltMV-IT, AltMV-MU, and AltMVPo CPs differ on substitutions at two sites, methionine 106 for isoleucine and serine 185 for phenylalanine [11]. AltMV-Au, AltMV-PA, AltMV-NAN, and AltMV-SP were classified as phlox-like isolates. Belonging to different groups, the CPs of AltMV-MU and AltMV-PA are different by 12 amino acid residues situated mainly on the N-terminus of CP [11]. Nucleotide sequences determined for AltMV isolates obtained from Scutellaria longifolia [12], Torenia [17], Angelonia angustifolia [15], and Thunbergia laurifolia plants [21] are too short for detailed analysis, yet most likely they belong to portulaca-like type [20].

The reported distribution of isolates may be determined by the peculiarities of the host plant cultivation. Annual phlox, cineraria, angelonia, torenia, thunbergia, and portulaca are grown mostly in greenhouses as ornamental plants, while perennial phlox and nandina with vegetative reproduction are cultivated in open ground. Similar conditions of plant cultivation most likely account for portulaca-like AltMV detection in greenhouse plants; moreover, portulaca might have served as an infection source for this type of horticulture. Similarly, the spread of phlox-like AltMV obtained from plants cultivated in open ground was the result of cross-contamination from infected perennial phlox plants [20].

According to serological data as well as nucleotide and amino acid sequence similarity, AltMV is the closest relative of the papaya mosaic virus (PapMV) [1, 2, 20]. AltMV is easily confused with PapMV based on serological analysis or PCR analysis in case of an incorrect primer selection [2] which leads to AltMV being misinterpreted as PapMV [12, 22]. Hammond et al. [2] argued that AltMV is far more widespread than expected, especially in nurseries and greenhouses.

3. AltMV Host Plants and Infection Symptoms

AltMV has a broad host range and can infect plants from at least 31 taxonomic families including Aizoaceae, Amaranthaceae, Apiaceae, Asteraceae, Brassicaceae, Caryophyllaceae, Chenopodiaceae, Cucurbitaceae, Fabaceae, Plantaginaceae, Polemoniaceae, and Solanaceae [19]. The virus was detected in several ornamental species including Portulaca grandiflora, Phlox stolonifera, Scutellaria spp., Crossandra infundibuliformis, Angelonia angustifolia, Torenia spp., Helichrysum spp., Salvia splendens, and Zinnia elegans [2, 12, 15, 17]. In addition to ornamentals, the systemically infected plants were found among various horticultural plants including Solanum lycopersicum, Viciafaba, Helianthus annuus, Citrullus lanatus, Cucumis sativus, and Vigna unguiculata [1]. The infected plants were mostly collected from commercial nurseries [2, 10,12,15,17,18,21].

Upon being infected with AltMV all representatives of the Amaranthaceae family including Alternanthera pungens exhibited symptoms [1]. On the contrary, plants of the families Caesalpiniaceae, Caricaceae, and Poaceae are not susceptible to AltMV infection. As papaya Carica papaya is the main host for PapMV, its insusceptibility to AltMV confirms that these viruses belong to different species [1].

AltMV is known to manifest a wide range of symptoms including chlorotic spotting of various size, chlorosis, chlorotic local lesions, leaf distortion and curling, mosaic, mottle, necrotic spotting of various size, necrotic ringspots, rugosity, veinal necrosis, and interveinal yellowing (Table 2) [1, 2,12,15,17].

AltMV infection symptoms were shown to depend not only on the host plant species, but also on the duration of infection, virus strain, and environmental factors. For example, symptoms being mostly pronounced in plants grown under high light levels and moderate temperature escaped notice in plants grown under low light levels and high temperature [2]. For AltMV-SP isolates derived from tobacco Nicotiana benthamiana the symptom severity was shown to correlate with sequence differences of the replicase (RdRp) and Triple Gene Block protein 1 (TGBp1) [23]. Similarly, in case of AltMV-Po isolate, the level of severity in symptom manifestation was demonstrated to go hand in hand with changes in amino acid sequence of CP [24].

The ability of AltMV to infect a wide host range leading to symptomless infection allows for cross-contamination among various species including the cultivated ones. Taking the aforementioned into account, AltMV may be more widespread than the literature suggests, particularly in nurseries [12, 20].

4. AltMV Propagation and Purification

Several methods were developed for AltMV isolation from a variety of host plants (Table 3). Geering and Thomas [1] followed the procedure previously described by Bancroft et al. [25]. The technique employed by Hammond et al. [2] was initially introduced for potexviruses and later adapted to potyviruses. In the studies by Mukhamedzhanova et al. [3] and Ivanov et al. [11] AltMV was isolated according to the protocol developed for another potexvirus, namely, potato virus X (PVX), with slight modifications. This technique was further substantially modified by Donchenko et al. [4].

Geering and Thomas [1] used Chenopodium amaranticolor as a host plant to propagate AltMV resulting in a yield of 23.4 mg of virus per 100 g of infected leaves. Even though the yield was relatively high, this host plant cannot be regarded as optimal for AltMV accumulation. Hammond et al. [2] managed to isolate AltMV from Nicotiana benthamiana with the yield of 8.6-12.5 mg of the virus per 100 g of green biomass while Mukhamedzhanova et al. [3] and Ivanov et al. [11] used Portulaca grandiflora as a host yielding 3.4 mg of virus per 100 g of infected leaves. Since P. grandiflora is hardly susceptible to infection with other viruses and N. benthamiana is a commonlyusedmodel plant, inthestudybyDonchenko et al. [4] portulaca and tobacco plants were selected as hosts [26]. In order to obtain purified AltMV, the infectious material was first propagated in P. grandiflora to prevent coinfection and later transmitted and accumulated in N. benthamiana. This allowed the yield to be substantially increased up to 20.0 mg and 573 mg of virus per 100 g of infected leaves in case of P grandiflora and N. benthamiana, respectively [4].

5. Structure of AltMV Genome

The AltMV genome consists of a sole positive-sense single-stranded RNA having a cap at the 5' terminus and polyA sequence at the 3' terminus [1]. Nucleotide sequence analysis of AltMV-PA genome [2] revealed two untranslated regions (UTR) at the 5' (1-94 nt) and 3' termini (6481-6607 nt) respectively, as well as 5 open reading frames (ORF). The first ORF encountered at the 5' end of the genome is the longest (95-4720 nt) and is capable of encoding a 1540 amino acid (aa) long protein, namely, a viral replicase (RdRp). The next three ORFs presumably encode the three movement proteins referred to as Triple Gene Block Proteins: ORF2 (4704-5402 nt, encodes a 26 kDa 232 aa long protein); ORF3 (5356-5688 nt, encodes a 12 kDa 110 aa long protein); and ORF4 (5624-5815 nt, encodes a 7 kDa 63 aa long protein). The extreme 3' end of the genome contains ORF5 (5858-6481 nt). Translation of the ORF5 produces a 22-23 kDa 207 aa residues long polypeptide being the CP. In addition, a comparatively short ORF6 was identified within all the presently known ORF5 of AltMV isolates [2, 11]. A sequence search through the Uniprot database failed to reveal any significant resemblance of the protein encoded by ORF6 to any known polypeptide. At present there is no evidence of ORF6 translation in vivo [2,11].

The UTR of the AltMV genome is located in the vicinity of the ORF5 stop codon at the 3' terminus. This 129 nt long genome region is highly conserved in AltMV isolates and the degree of nucleotide homology reaches 98% for some of them. This may be connected with the localization of the replicase recognition sites within this region [20]. Nevertheless, the secondary structure and the functions of the 3' UTR of the AltMV genome are yet to be determined. The same is also true for the 5' UTR as well as for putative regulatory elements of the AltMV genome. Furthermore, the presence of the conserved elements, namely, the octanucleotide and hexanucleotide motifs, suggests that their function in AltMV genome may be similar to that in the PVX one [2, 27]. Notably, no conserved polyadenylation signal similar to bamboo mosaic virus and PVX was detected in the 3' UTR of AltMV [28].

6. Alternanthera Mosaic Virus-Based Vectors

To estimate the correlation of symptom severity and efficiency of cell-to-cell movement with various mutations in TGBp1 and AltMV replicase sequences Lim et al. [29] constructed a viral vector based on AltMV genome. The vector was further applied to outline the functions of AltMV TGBp3 [23] by means of fluorescent reporter proteins DsRed and GFP. Both works employed the same vector design with the reporter gene sequences being inserted between TGBp3 and CP genes under the control of the additional subgenomic (sg) promoter of AltMV CP [29].

A bipartite vector was also derived from AltMV-SP. Its first fragment contained AltMV replicase gene, the second one comprised TGB and CP gene of AltMV. In order to facilitate the cloning, the construction was divided into two parts: following plant tissue transformation with both fragments the complete AltMV genome was produced through recombination. The second component of the vector system was obtained in two versions. The vector was designed for target protein expression in plants and virus-induced gene silencing (VIGS) [23, 29]. Using the AltMV VIGS vector suppression of endogenous 4/1 protein of N. benthamiana expression and influence of Potato spindle tuber viroid movement in 4/1-silenced plants were demonstrated [30, 31]. Vectors AltMV-L-att and AltMV-P-att were created by insertion of the Gateway cloning cassette into the AltMV multiple cloning site (between the triple gene block and the CP gene) for protein expression and VIGS applications, respectively [32].

Several variants of the deconstructed viral AltMV-MU based vectors enabled heterologous proteins to be expressed in plants. TGB was deleted from the AltMV genome, while the target gene was placed under the control of either the AltMV additional sg promoter 1 (AltMV-single vector) or the two consecutive viral promoters sg promoter 1 and sg promoter 3 (AltMV-double vector) previously described in Lim et al. [23]. In comparison with AltMV-single, AltMV-double was demonstrated to produce higher target protein yield due to simultaneous functioning of the two sg promoters. AltMV CP and human granulocyte colony-stimulating factor were expressed as model proteins in the recent study [8]. Although an attempt was made to increase the protein accumulation level by using three sg promoters simultaneously, this approach failed to succeed [33].

7. AltMV Proteins

7.1. AltMV RNA-Dependent RNA Polymerase (RdRp). Two predicted domains (the helicase and the polymerase ones) were identified in AltMV RdRp amino acid sequence by the BLAST algorithm [2]. Before helicase domain methyl transferase and 2-oxoglutarate-Fe(II) oxygenase domains are located [19]. Four variants of infectious clones derived from the AltMV-SP genome caused various symptoms in infected N. benthamiana plants and differed from each other in several amino acid substitutions in viral proteins including RdRp [23]. The clones were referred to as 3-1, 3-7,4-1, and 4-7. None of them induced the infection symptoms similar to those of AltMV-SP isolate. Plant infection and two of the clones (37 and 4-7) lead to necrosis and eventual death, while in case of combining four of them milder symptoms were revealed. The replication rate increased at least 4 times at 15[degrees]C in all the clones. Plants inoculated with the mixture of 4-7 ('severe') and 3-1 ('mild') isolates developed symptoms similar to the ones caused by AltMV-SP, while the clone ratio was different at 25 and 15[degrees]C. The clones causing severe symptoms and high necrosis rate (3-7, 4-7) differed from those causing milder infection by several substitutions in the replicase amino acid sequence. Therefore, severe symptoms and higher necrosis rate were characteristic of P1110/R1121/K1255 replicase variant and milder symptoms, of R1110/K1121/R1255 variant. Notably, all the aforementioned amino acid substitutions were located in the polymerase domain of the protein [23].

The AltMV RdRp comprises 1540 aa with solely 68 varying among the isolates [20]. Although the difference by 45 amino acid substitutions between the RdRp of infectious clones 3-1 and 4-7 accounts for significant changes in replication efficiency [7, 29], only slight distinctions between the phlox and the portulaca isolates were detected through a phylogenetic tree analysis [20].

7.2. AltMV TGBpl. BLAST analysis performed for amino acid sequence of AltMV TGBp1 predicted the existence of N-terminal helicase domain [2].

Similarly to AltMV replicase, TGBp1 of AltMV-SP various clones manifest differences in their amino acid sequences. Part of the clones has leucine residue (TGBp1L88) and the other part has proline residue at 88 position (TGBp1P88) [29]. Solely TGBp1L88 is able to efficiently suppress posttranscriptional gene silencing in plants. Further investigation into the phenomenon revealed that the virus variant expressing TGBp1P88 has a lower replication rate in comparison with the variant expressing TGBp1L88. At the same time, both of the TGBp1 variants are capable of supporting the cell-to-cell movement although at different rates with TGBp1P88 slowing down the spread of infection. Notably, simultaneous expression of the two TGBp1 variants in plant cells reduces the antisilencing activity of the protein which implies the interaction between the two variants [29]. This interaction was confirmed using a yeast two-hybrid system. Subcellular localization of the TGBp1 variants by means of laser scanning confocal microscopy of N. benthamiana leaves indicated that TGBp1L88 is localized in the nuclear membrane and forms discrete aggregates in the nucleolus, while TGBp1P88 is localized in the nuclear periplasm [23]. Outside the nucleus TGBp1L88 was demonstrated to reside at the cell wall as small punctate aggregates, which suggests its association with plasmodesmata. On the contrary, TGBp1P88 was diffusely distributed throughout the cytoplasm. Since the helicase domain I of PVX TGBp1 has been previously reported to be required for in vitro oligomerization [34, 35], amino acid sequences alignment of AltMV TGBp1 and PVX TGBp1 was carried out in search for AltMV TGBp1 oligomerization sites. As a result, 7 conserved sequence motifs were identified in the helicase domain of AltMV TGBp1. The mutants carrying substitutions G31R and GK33/34RR in domain I of TGBp1 were unable to dimerize in the yeast two-hybrid system. The disrupted interaction was also observed in vivo in N. benthamiana plants by means of bimolecular fluorescence complementation. This argues for a crucial role of the protein domain I in the dimerization. As far as domains II and III are concerned, nomutation saltered the dimerization process. The oligomerization of AltMV TGBp1 molecules is essential for silencing suppression [36]. Visualizing subcellular localization of AltMV TGBp1 variants both functional and defective in terms of oligomerization revealed the following pattern: AltMV TGBp1 variants capable of oligomerization were localized at the nucleolus or at the cell wall, while the mutant ones occupied the nucleoplasm instead of the nucleolus and were not detected in the vicinity of the cell wall [36]. These data suggest that TGBp1 oligomerization plays a key role both in cell-to-cell movement and silencing suppression.

AltMV TGBp1 is capable of selectively binding to several cellular proteins [37], namely, mitochondrial ATP synthase delta chain subunit, light-harvesting chlorophyll-protein complex I subunit A4, chlorophyll a/b binding protein, chloroplast IscA-like protein, and chloroplast [beta]-ATPase. The latter was demonstrated to specifically bind solely to AltMV TGBp1L88 variant which is efficient silencing suppressor. At the same time, no interaction between the chloroplast [beta]-ATPase and TGBp1P88 was detected. Since the virus-induced suppression of the protein expression induces severe symptoms in the host plant, the [beta]-ATPase is considered to be involved in host plant immune response. Therefore, the interaction between the [beta]-ATPase and TGBp1P88 appears to inhibit this process [37].

Similarly to PVX TGBp1, TGBp1 of AltMV is capable of interacting with one end of the virion thus activating RNA translation in vitro [3, 38].

7.3. AltMV TGBp2. To date, little is known about AltMV TGBp2 structure except for a transmembrane domain identified by BLAST amino acid sequence analysis [2]. Despite high sequence similarity with only six out of 110 amino acid residues varying among the isolates, portulaca-like AltMVPo and AltMV-IT comprise a clade clearly distinct from the five phlox isolates, with the bootstrap value of 100% [20].

7.4. AltMV TGBp3. The three-dimensional structure of AltMV TGBp3 remains unresolved, and no specific domains have been revealed by BLAST search [2]. Up to now, two papers have addressed this issue [29, 39] and demonstrated AltMV TGBp3 to differ substantially from the homologous PVX one by subcellular as well as tissue localization patterns. In the infected leaves the fluorescently labeled TGBp3 was predominantly localized at the outer chloroplast membrane of mesophyll cells. Interestingly, TGBp3 overexpression induced chloroplast membrane vesiculation and veinal necrosis and contributed to the overall symptom severity. Deletion analysis indicated two amino acid residues (17V18L) of TGBp3 serving as the unique signal of AltMV TGBp3 localization in chloroplast membranes [29]. Moreover, TGBp3 is capable of directly interacting with the PsbO protein of the Photosystem II oxygen-evolving complex [39]. This interaction is governed by N-terminal region of TGBp3 from residue 16 to residue 20. The signal sequence required for AltMV TGBp3 chloroplast surface targeting is also localized within this region [29]. This may provide solid evidence for AltMV TGBp3 targeting chloroplast membrane through PsbO interaction, which in its turn is transported to chloroplasts from the cytoplasm where it is synthesized [39]. Thus, the efficiency of the interaction between PsbO and AltMV TRGp3 correlates with the severity of such symptoms as veinal necrosis and chloroplast membrane vesiculation. In case of impaired TGBp3 expression the virus lost the ability to enter the mesophyll cells and therefore cause systemic infection, which underlines the crucial role of TGBp3 in this process. Herewith, the defective virus demonstrated a comparatively limited ability to spread within epidermis with no systemic movement [29]. Visualizing the subcellular localization of AltMV RNA by means of fluorescence in situ hybridization indicated that the viral RNA as well as TGBp3 primarily accumulates near the surface of the chloroplast membrane. At the same time, the major amount of RNA was detected in mesophyll cells [29]. This drives to the conclusion that the AltMV replication occurs mostly in mesophyll cells, more specifically, at the outer chloroplast membrane. Interestingly, the presence of cellular TGBp2 exhibited no influence on AltMV TGBp3 subcellular localization as opposed to PVX TGBp3 [29, 40].

7.5. AltMV CP. AltMV coat protein (CP) is a 22-23-kDa protein comprising 207 aa. Together with AltMV replicase and TGBp1, AltMV CP determines symptom severity in host plants [24].

Both AltMV and PVX virions were found to be translationally activated. The AltMV genomic RNA is normally encapsidated and completely nontranslatable in vitro; however, translation can be activated through the phosphorylation of AltMV CP by protein kinase C or by TGBp1 binding to the viral particle [3].

AltMV CP was shown to assemble into stable extended polymers commonly referred to as VLPs in vitro under various conditions. Similarly to PapMV CP [41] AltMV CP formed extended VLPs in vitro in the absence of RNA at pH 4.0 and low ionic strength [3]. However, PapMV CP was incapable of forming RNA-free VLPs at pH 8.0, while AltMV CP formed particles morphologically resembling native virions under the same conditions [3]. In contrast to PapMV VLPs, AltMV ones were demonstrated to be highly stable under a wide range of conditions [3, 4]. According to their serological properties [3], virions and VLPs of AltMV are structurally different. Recent findings suggest that despite high morphological similarity, AltMV CPs possess a different fold in virions containing RNA and in RNA-free VLPs. By means of cryoelectron microscopy (CryoEM) the diameter of AltMV VLPs was measured to be 15.2 nm, thus exceeding that of AltMV virions (13.5 nm). Authors suggest that the absence RNA contributes significantly in increasing of VLPs central channel diameter (30 A) versus virions (20 [Angstrom]). CryoEM image processing demonstrated that VLPs possessed a larger number of CP subunits per turn (9.55) than AltMV virions (8.75) with the same pitch (35.7 [Angstrom]) [4]. The authors hypothesize that, despite the similarity of AltMV virions and VLPs in the overall morphology when studied at low magnification, the folding and intersubunit interactions of AltMV CP differ in the presence and absence of RNA.

Tyulkina with colleagues [42] designed the hybrid viral vectors based on PVX genome and AltMV CP gene fused with sequences of influenza virus A M2e epitope. This vector was used for expression of chimeric AltMV CP in plant and VLP assembly. The authors considered this VLP as candidate vaccines [42]. Unlike PapMV there are no other works using AltMV virions or VLP as a platforms for epitopes presentation.

Both AltMV VLPs and virions demonstrated high stability under a wide range of conditions. It was shown that viral particles and VLPs do not change their morphology and size during incubation in distilled water, 0.15 M NaCl, and 0.01 M Tris-HCl, 0.15 M NaCl, and pH 75. Particularly worth mentioning is that AltMV virions and VLPs also remained stable after 1 hour incubation in mouse serum. Therefore, the absence of RNA in the VLP and the absence of RNA-protein interactions did not affect the stability of the protein helix of the AltMV VLPs under the selected conditions. [4]. Moreover, high immunostimulating properties resulting in significant enhancement of immune response to a model antigen in test animals were shown for both types of particles [43]. These data ensure the practical application of virions and VLPs of AltMV as an adjuvant platform for vaccine development. Both types of virus particles have numerous advantages such as assembly conditions and stability of the particles in comparison with the AltMV closest relative, namely, PapMV, that has been already applied most successfully in this field of research [44,45].

8. Conclusion

Alternanthera mosaic virus (AltMV) is a representative of potexviruses with genome structure and virion morphology typical of the group. Additionally, AltMV has been proved to have various desirable properties in terms of its practical application. Moreover, the protocols for the virus particles production and purification have been elaborated establishing the foundation for their further application. Numerous viral vectors were derived from the AltMV genomes providing a perspective tool for target protein production in plants. Stability under a broad range of conditions as well as the immunostimulating properties make AltMV virions and virus-like particles a powerful tool for a plethora of biomedical applications.

https://doi.org/10.1155/2018/1973705

Conflicts of Interest

The authors declare that they have no conflicts of interest.

Acknowledgments

This work was supported by the Russian Science Foundation (Grant no. 14-24-00007).

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Ekaterina Donchenko, Ekaterina Trifonova (iD), Nikolai Nikitin (iD), Joseph Atabekov (iD), and Olga Karpova (iD)

Department of Virology, Lomonosov Moscow State University, Moscow 119234, Russia

Correspondence should be addressed to Nikolai Nikitin; nikitin@mail.bio.msu.ru

Received 21 March 2018; Accepted 23 May 2018; Published 19 June 2018

Academic Editor: Finn S. Pedersen
Table 1: AltMV isolates.

Virus isolate     Accession no.            Authors

                       Phlox-like isolates

AltMV-AU             AF080448        Geering and Thomas,
                                             1999
AltMV-PA             AY863024          Hammond et al.,
                                        2004, 2006a, b
AltMV-SP             AY850931          Hammond et al.,
                                        2004, 2006a, b
AltMV-BR             AY850928          Hammond et al.,
                                        2004, 2006a, b
AltMV-NAN            GU126686         Tang et al., 2010
AltMV-BW             JX457329        Hammond and Reinsel,
                                             2015
AltMV-LGB            JX457330        Hammond and Reinsel,
                                             2015
AltMV-PGL            JQ405265        Hammond and Reinsel,
                                             2015

                       Portulaca-like isolates

AltMV-IT             AY566288         Ciuffo and Turina,
                                             2004
AltMV-Po             AY850930          Hammond et al.,
                                        2004, 2006a, b
AltMV-MU             FJ822136        Ivanov et al., 2011
AltMV-Port           JQ405269        Hammond and Reinsel,
                                             2015
AltMV-PLR            JQ405266        Hammond and Reinsel,
                                             2015
AltMV-CIN            JQ405268        Hammond and Reinsel,
                                             2015

                             Asian isolate

AltMV-Ac             LC107515          Iwabuchi et al.,
                                             2016

                            Unassigned isolates

AltMV Florida        DQ393785         Baker et al., 2006
isolate
AltMV-T              FJ232066,        Duarte et al., 2008
                     FJ232067
AltMV angelonia      EU679363            Lockhart and
isolate                                Daughtrey, 2008
AltMV isolate        JQ687034          Vitoreli et al.,
G10-00982                                    2011

Virus isolate       Original host        Origin of infected
                                               plants

                           Phlox-like isolates

AltMV-AU            Alternanthera          Australia, QLD
                       pungens
AltMV-PA          Phlox stolonifera           USA, PA
AltMV-SP          Phlox stolonifera           USA, MD
                 cv. Sherwood Purple
AltMV-BR          Phlox stolonifera           USA, MD
                   cv. Blue Ridge
AltMV-NAN         Nandina domestica           USA, OK
AltMV-BW          Phlox stolonifera           USA, MD
                  cv. Bruce's White
AltMV-LGB       Phlox divaricata cv.          USA, MD
                  London Grove Blue
AltMV-PGL          Phlox carolina               USA
                       angusta

Portulaca-like isolates

AltMV-IT              Portulaca           Italy, Liguria,
                     grandiflora              Albenga
AltMV-Po              Portulaca               USA, MD
                     grandiflora
AltMV-MU              Portulaca         South-Eastern Europe
                     grandiflora
AltMV-Port            Portulaca                 USA
                     grandiflora
AltMV-PLR           Phlox hybrid                USA
                      (annual)
AltMV-CIN         Pericallis hybrid             USA

Asian isolate

AltMV-Ac             Achyranthes            Japan, Tokyo
                      bidentata

Unassigned isolates

AltMV Florida       Portulaca sp.             USA, FL
isolate             Scutellaria
                     longifolia
                     Crossandra
                  infundibuliformis
AltMV-T              Torenia sp.         Brazil, Sao Paulo
AltMV angelonia       Angelonia               USA, NY
isolate             angustifolia
AltMV isolate        Thunbergia               USA, FL
G10-00982            laurifolia

Table 2: Diversity of AltMV host plants and infection symptoms.

Family                       Host                     Symptoms

                                                        local

Aizoaceae             Tetragonia expansa          necrotic ringspot

                     Amaranthus caudatus       necrotic local lesions
                     Amaranthus tricolor       chlorotic local lesions
Amaranthaceae        Gomphrena celosiodes      asymptomatic infection
                      Gomphrena globosa        necrotic local lesions

                    Alternanthera dentata      necrotic local lesions

Apiaceae            Apium graveolens, cv.      necrotic local lesions
                         Crisp Salad
                      Aster novi-belgii             no infection
                      Dahlia variabilis             no infection
                      Helianthus annuus        asymptomatic infection
Asteraceae          Sanvitalia procumbens           no infection

                       Lactuca sativa,         necrotic local lesions
                       cv. Black velvet
                        Zinnia elegans         asymptomatic infection

Brassicaceae       Brassica campestris var.    asymptomatic infection
                   pekinensis cv. Lin White         no infection
                   Spoon Rhaphanus sativus
                     cv. French Breakfast

Caesalpiniaceae       Cassia floribunda             no infection
                     Cassia occidentalis            no infection

Caricacene            Carica papaya cv.             no infection
                         Richter Gold

Caryophyllaceae       Gypsophila repens        asymptomatic infection

Chenopodiaceae           Chenopodium           chlorotic local lesions
                        amaranticolor
                      Chenopodium quinoa       chlorotic local lesions
                                               /necrotic local lesions
                      Spinacia oleracea        chlorotic local lesions
                                                    /no infection

Cucurbitaceae       Citrullus lanatus var.     asymptomatic infection
                     Caffer cv. Candy Red
                  Cucumis sativus cv. Green    asymptomatic infection
                             Gem
                     Cucumis sativus (two           no infection
                          cultivare)
                   Cucurbita pepo cv. Green    asymptomatic infection
                           Buttons

Fatacene            Glycine max cv. Bragg           no infection
                    Phaseolus vulgaris cv.          no infection
                          Bountiful
                    Phaseolus vulgaris cv           no infection
                            Kerman
                      Pisum sativum cv.             no infection
                          Greenfeast
                    Trifolium pratense cv.          asymptomatic
                          Montgomery                  infection
                    Vigna unguiculata cv.           asymptomatic
                                                     infection/
                          Black-eye                 no infection
                          Vicia faba                asymptomatic
                                                     infection/
                                                    no infection

Papaveraceae          Papaver orientale             no infection

Plantaginaceae       Plantago lanceolata            asymptomatic
                                                      infection
Poaceae               Sorghum halapense             no infection
                           cv. Silk
                     Zea mays cv. Jubilee           no infection

Polemoniaceae          Phlox drummondii             no infection
                      Phlox stolonifera                mottle

Solanaceae           Capsicum annuum cv.            no infection

                         Yolo Wonder
                      Datura stramonium             no infection

                    Solanum lycopersicum       asymptomatic infection
                       cv. Gross Lisse              /no infection
                    Nicotiana benthamiana      asymptomatic infection
                                                     /chlorotic
                                                    local lesions
                    Nicotiana clevelandii           no infection

                    Nicotiana edwardsonii           no infection

                     Nicotiana glutinosa            no infection

                    Nicotiana megalosiphon         necrotic local
                                                 lesions, necrotic
                                                      ringspot
                      Nicotiana rustica             no infection
                      Nicotiana tabacum             no infection

                         cv. Turkish
                      Nicotiana tabacum             no infection
                          cv. Xanthi
                      Physalis fiondanti            no infection

                      Solanum melongena             no infection

                      Solanum tuberosum             no infection
                          cv. Sebago

Family                       Host                     Symptoms

                                                      systemic

Aizoaceae             Tetragonia expansa         chlorosis, veinal
                                                 necrosis, leaf curl
                     Amaranthus caudatus            no infection
                     Amaranthus tricolor               mosaic
Amaranthaceae        Gomphrena celosiodes              mosaic
                      Gomphrena globosa        asymptomatic infection

                    Alternanthera dentata        necrotic spotting,
                                                     distortion

Apiaceae            Apium graveolens, cv.              mosaic
                         Crisp Salad
                      Aster novi-belgii             no infection
                      Dahlia variabilis             no infection
                      Helianthus annuus             no infection
Asteraceae          Sanvitalia procumbens        mosaic, leaf curl,
                                                     distortion
                       Lactuca sativa,              no infection
                       cv. Black velvet
                        Zinnia elegans          mottle/ asymptomatic
                                                      infection

Brassicaceae       Brassica campestris var.         no infection
                   pekinensis cv. Lin White         no infection
                   Spoon Rhaphanus sativus
                     cv. French Breakfast

Caesalpiniaceae       Cassia floribunda             no infection
                     Cassia occidentalis            no infection

Caricacene            Carica papaya cv.             no infection
                         Richter Gold

Caryophyllaceae       Gypsophila repens             no infection

Chenopodiaceae           Chenopodium                   mosaic
                        amaranticolor
                      Chenopodium quinoa        interveinal yellowing
                                                    /no infection
                      Spinacia oleracea        mosaic/necrotic fleck,
                                                      leaf curl

Cucurbitaceae       Citrullus lanatus var.             mosaic
                     Caffer cv. Candy Red
                  Cucumis sativus cv. Green    asymptomatic infection
                             Gem
                     Cucumis sativus (two           no infection
                          cultivare)
                   Cucurbita pepo cv. Green         no infection
                           Buttons

Fatacene            Glycine max cv. Bragg           no infection
                    Phaseolus vulgaris cv.          no infection
                          Bountiful
                    Phaseolus vulgaris cv           no infection
                            Kerman
                      Pisum sativum cv.             no infection
                          Greenfeast
                    Trifolium pratense cv.          no infection
                          Montgomery
                    Vigna unguiculata cv.      asymptomatic infection

                          Black-eye                 /no infection
                          Vicia faba           mosaic/chlorotic fleck

Papaveraceae          Papaver orientale             no infection

Plantaginaceae       Plantago lanceolata               mosaic

Poaceae               Sorghum halapense             no infection
                           cv. Silk
                     Zea mays cv. Jubilee           no infection

Polemoniaceae          Phlox drummondii              mild mottle
                      Phlox stolonifera                mottle

Solanaceae           Capsicum annuum cv.            no infection

                         Yolo Wonder
                      Datura stramonium             no infection

                    Solanum lycopersicum         mottle/mild mottle,
                       cv. Gross Lisse                leaf curl
                    Nicotiana benthamiana        mosaic, rugosity,
                                                      epinasty

                    Nicotiana clevelandii           no infection/
                                                   mild chlorosis
                    Nicotiana edwardsonii           no infection

                     Nicotiana glutinosa            no infection

                    Nicotiana megalosiphon        mosaic, necrotic
                                                        fleck

                      Nicotiana rustica             no infection
                      Nicotiana tabacum             no infection

                         cv. Turkish
                      Nicotiana tabacum             no infection
                          cv. Xanthi
                      Physalis fiondanti            no infection

                      Solanum melongena           faint chlorotic
                                                 spotting, rugosity
                      Solanum tuberosum             no infection
                          cv. Sebago

Family                       Host                     Authors

Aizoaceae             Tetragonia expansa        Hammond et al, 2006b

                     Amaranthus caudatus        Hammond et al, 2006b
                     Amaranthus tricolor        Geering and Thomas,
Amaranthaceae        Gomphrena celosiodes               1999
                      Gomphrena globosa         Geering and Thomas,
                                                   1999; Hammond
                                                    et al, 2006b
                    Alternanthera dentata      Hammond et. al, 2006b

Apiaceae            Apium graveolens, cv.       Geering and Thomas,
                         Crisp Salad                    1999
                      Aster novi-belgii
                      Dahlia variabilis         Hammond et al, 2006b
                      Helianthus annuus
Asteraceae          Sanvitalia procumbens

                       Lactuca sativa,          Geering and Thomas,
                       cv. Black velvet                 1999
                        Zinnia elegans          Geering and Thomas,
                                               1999/
                                                Hammond et al, 2006b

Brassicaceae       Brassica campestris var.     Geering and Thomas,
                   pekinensis cv. Lin White             1999
                   Spoon Rhaphanus sativus
                     cv. French Breakfast

Caesalpiniaceae       Cassia floribunda             Geering and
                     Cassia occidentalis            Thomas, 1999

Caricacene            Carica papaya cv.             Geering and
                         Richter Gold               Thomas, 1999

Caryophyllaceae       Gypsophila repens         Hammond et al, 2006b

Chenopodiaceae           Chenopodium                Geering and
                        amaranticolor               Thomas, 1999
                      Chenopodium quinoa            Geering and
                                               Thomas, 1999
                      Spinacia oleracea        /Hammond et al, 2006b

Cucurbitaceae       Citrullus lanatus var.          Geering and
                     Caffer cv. Candy Red           Thomas, 1999
                  Cucumis sativus cv. Green
                             Gem
                     Cucumis sativus (two         Hammond et al,
                          cultivare)                   2006b
                   Cucurbita pepo cv. Green         Geering and
                           Buttons                  Thomas, 1999

Fatacene            Glycine max cv. Bragg       Geering and Thomas,
                    Phaseolus vulgaris cv.              1999
                          Bountiful
                    Phaseolus vulgaris cv            al, 2006b
                            Kerman
                      Pisum sativum cv.
                          Greenfeast
                    Trifolium pratense cv.          Geering and
                          Montgomery                Thomas, 1999
                    Vigna unguiculata cv.           Geering and
                                                    Thomas, 1999
                          Black-eye                 /Hammond et
                          Vicia faba                 al, 2006b

Papaveraceae          Papaver orientale         Hammond et al, 2006b

Plantaginaceae       Plantago lanceolata        Geering and Thomas,
                                                        1999
Poaceae               Sorghum halapense         Geering and Thomas,
                           cv. Silk                     1999
                     Zea mays cv. Jubilee

Polemoniaceae          Phlox drummondii         Hammond et al, 2006b
                      Phlox stolonifera

Solanaceae           Capsicum annuum cv.        Geering and Thomas,
                                                       1999/
                         Yolo Wonder            Hammond et al, 2006b
                      Datura stramonium         Geering and Thomas,
                                                        1999
                    Solanum lycopersicum        Geering and Thomas,
                       cv. Gross Lisse         1999/
                    Nicotiana benthamiana       Hammond et al, 2006b

                    Nicotiana clevelandii

                    Nicotiana edwardsonii         Hammond et al,
                                                   2006b Geering
                     Nicotiana glutinosa         and Thomas, 1999/
                                                Hammond et al, 2006b
                    Nicotiana megalosiphon      Hammond et al, 2006b

                      Nicotiana rustica
                      Nicotiana tabacum         Geering and Thomas,
                                                        1999
                         cv. Turkish                /Hammond et
                      Nicotiana tabacum              al, 2006b
                          cv. Xanthi
                      Physalis fiondanti        Geering and Thomas,
                                                        1999
                      Solanum melongena         Hammond et al, 2006b

                      Solanum tuberosum         Geering and Thomas,
                          cv. Sebago                    1999

Table 3: Comparison of AltMV isolation procedures.

Isolation and           Geering and Thomas,
purification steps              1999

Yield (mg of             23.4 /Chenopodium
virus/100 g of green      amar anticolor 1
plant biomass) and
host plants used

Homogenization          0.02 M Sodium borate
buffer                      buffer, 0.5%
                       [Na.sub.2],S[O.sub.3],
                           pH 8.2 (250 ml
                        buffer per 150 g of
                              leaves)

Virus enrichment        centrifugation 0.5%
from plant tissue           Triton X-100

Extraction of virus              --
from pellets

Ultracentrifugation      (1) Separation by
steps                      10-40% sucrose
                          gradient (0.01 M
                         Tris-HCl, 0.001 M
                         EDTA, pH 8.0) (85
                        000 g, 4 hours) (2)
                        Virus precipitation
                           (85 000 g, 2.5
                               hours)

Spectrophotometric              2.84
analysis
([E.sub.1cm],
[0.1%.sub.260nm])

                                Authors

Isolation and               Hammond et al.,
purification steps               2006b

Yield (mg of               8.6-12A/Nicotiana
virus/100 g of green         benthamianal
plant biomass) and
host plants used

Homogenization             0.5 M [K.sub.2]H-
buffer                   K[H.sub.2]P[0.sub.4],
                       0.5%[Na.sub.2],S[O.sub.3]
                           pH8.4 (3-5 buffer
                          volumes per weight
                              of leaves)

Virus enrichment           centrifugation 2%
from plant tissue        Triton X-100, 4% PEG
                           Mr 8000, 2% NaCl

Extraction of virus       Extraction in 0.1 M
from pellets                 Sodium borate
                          buffer, 0.1 M KC1,
                          pH 8.0 (BK buffer),
                            0.75-1.5 hours.

Ultracentrifugation        (1) Separation by
steps                     30% sucrose cushion
                          (BK buffer) (85 600
                           g, 2.5 hours) (2)
                          Separation by CsCl
                           gradient, density
                           1.32 g-[cm.sup.3]
                           (139 000 g, 16-20
                          hours) (3) Dialysis
                            against 0.5x BK
                            buffer in 11 (3
                               changes)

Spectrophotometric                2.5
analysis
([E.sub.1cm],
[0.1%.sub.260nm])

                                Authors

Isolation and           Mukhamedzhanova et     Donchenko et al., 2017
purification steps     al., 2011; Ivanov et
                             al, 2011

Yield (mg of              3.4 /Portulaca           20.0 /Portulaca
virus/100 g of green       grandiflora/           grandiflora/573/
plant biomass) and                                    Nicotiana
host plants used                                    benthamianal

Homogenization          0.3 M glycine-KOH,       0.3 M glycine-KOH,
buffer                          l%                       1%
                       [Na.sub.2],S[O.sub.3]   [Na.sub.2],S[O.sub.3],
                        pH 7.5 (3 mi buffer      pH 7.5 (3 mi buffer
                        per 1 g of leaves)       per 1 g of leaves)

Virus enrichment         centrifugation 1%        centrifugation 1%
from plant tissue       Triton X-100 5% PEG       Triton X-100 Two
                         Mr 6000, 2% NaCl             stages of
                             (Personal          precipitation: (1)
                          communication)         5% PEG Mr 6000, 2%
                                                 NaCl (2)    8% PEG
                                                       Mr 6000

Extraction of virus    Extraction in 0.05 M     Extraction in 0.05 M
from pellets             Tris-HCl, 0.01 M         Tris-HCl, 0.01 M
                           EDTA, pH 8.0,          EDTA, pH 8.0, Two
                             (Personal             stages for 2-6
                          communication)               hours.

Ultracentrifugation          (1) Virus                (1) Virus
steps                   precipitation (100       precipitation (111
                         000 g, 1.5 hours)       000 g, 3 hours) (2)
                             (Personal            Separation by 30%
                        communication) (2)         sucrose cushion
                         Separation by 30%       (extraction buffer)
                       sucrose cushion (110     (111 000 g, 4 hours)
                         000 g, 2.5 hours)
                             (Personal
                          communication)

Spectrophotometric             2.84                     2.84
analysis
([E.sub.1cm],
[0.1%.sub.260nm])
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Author:Donchenko, Ekaterina; Trifonova, Ekaterina; Nikitin, Nikolai; Atabekov, Joseph; Karpova, Olga
Publication:Advances in Virology
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Date:Jan 1, 2018
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