title: Enhanced methionine levels and increased nutritive value of seeds of transgenic lupins (Lupinus angustifolius L.) expressing a sunflower seed albumin gene.
abstract: With the aim of improving the nutritive value of an important grain legume crop, a chimeric gene specifying seed-specific expression of a sulfur-rich, sunflower seed albumin was stably transformed into narrow-leafed lupin (Lupinus angustifolius L.). Sunflower seed albumin accounted for 5% of extractable seed protein in a line containing a single tandem insertion of the transferred DNA. The transgenic seeds contained less sulfate and more total amino acid sulfur than the nontransgenic parent line. This was associated with a 94% increase in methionine content and a 12% reduction in cysteine content. There was no statistically significant change in other amino acids or in total nitrogen or total sulfur contents of the seeds. In feeding trials with rats, the transgenic seeds gave statistically significant increases in live weight gain, true protein digestibility, biological value, and net protein utilization, compared with wild-type seeds. These findings demonstrate the feasibility of using genetic engineering to improve the nutritive value of grain crops.
authors.affiliation: Division of Plant Industry, Commonwealth Scientific and Industrial Research Organization, G.P.O. Box 1600, Canberra, 2601, Australia.
authors.forename: L
authors.initials: L
authors.lastname: Molvig
authors.forename: L M
authors.initials: LM
authors.lastname: Tabe
authors.forename: B O
authors.initials: BO
authors.lastname: Eggum
authors.forename: A E
authors.initials: AE
authors.lastname: Moore
authors.forename: S
authors.initials: S
authors.lastname: Craig
authors.forename: D
authors.initials: D
authors.lastname: Spencer
authors.forename: T J
authors.initials: TJ
authors.lastname: Higgins
mesh_terms: D000418:Albumins / Q000008:administration & dosage* / Q000235:genetics; D000818:Animals; D001835:Body Weight / Q000187:drug effects*; D006368:Helianthus / Q000235:genetics*; D008715:Methionine / Q000378:metabolism*; D030821:Plants, Genetically Modified / Q000235:genetics / Q000378:metabolism*; D051381:Rats
chemical_list: D000418:Albumins; D008715:Methionine