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Molecular Biology and Evolution, Vol 6, 614-623, Copyright © 1989 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

Evolution of legume seed storage proteins--a domain common to legumins and vicilins is duplicated in vicilins

PE Gibbs, KB Strongin and A McPherson
Department of Biochemistry, University of California, Riverside 92521.

We examined the primary sequence of canavalin, the major storage protein of jack beans, and found that an ancient sequence duplication accounts for 80% of the amino acid residues. Evidence for such a duplication was also found in the orthologous proteins phaseolin and pea vicilin. This sequence duplication presumably accounts for a structural duplication in the canavalin monomer observed by crystallographic analysis. One copy of this repeat was found in a second storage-protein family, the legumins, where it encompasses almost the entire B-chain of the mature molecule. We propose that the vicilin and legumin families of legume seed proteins evolved from a common precursor, which consisted of one copy of the repeat in the vicilins.
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