du Pont obtains United States patent.
E. I. du Pont de Nemours and Company (Wilmington, DE) has patented
an isolated nucleic acid fragment encoding a plant enzyme that catalyze
steps in the biosynthesis of lysine, threonine, methionine, cysteine and
isoleucine from aspartate, the enzyme a member selected from the group
consisting of: dihydrodipicolinate reductase, diaminopimelate epimerase,
threonine synthase, threonine deaminase and S-adenosylmethionine
synthetase. The invention also relates to the construction of a chimeric
gene encoding all or a portion of the enzyme, in sense or antisense
orientation, wherein expression of the chimeric gene results in
production of altered levels of the enzyme in a transformed host cell.