Abstract
Legumin-like 11S and vicilin-like 7S globulins are the main storage proteins of most angiosperms and gymnosperms. The subunits of the hexameric legumin are synthesized as a precursor comprising a N-terminal acidic α- and a C-terminal basic β-chain. The trimeric vicilin molecule consists of subunits composed of two symmetrical N- and C-terminal structural domains.
In a multiple alignment we have compared the N-terminal and C-terminal domains of 11 legumns and seven vicilins of several dicot, monocot, and gymnosperm species. The comparisons using all six possible pairwise combinations reveal that the N-terminal and C-terminal domains of both protein families are similar to each other. These results together with data on the distribution of variable and conserved regions, on the positions of susceptible sites for proteolytic attack, as well as on the published 7S protein tertiary structure suggest that both protein families share a common single-domain ancestor molecule and lead to the hypothesis that a triplication event has occurred during the evolution of a putative legumin/vicilin ancestor gene.
Moreover, the comparison of the intron/exon pattern reveals that at least three out of five intron positions are precisely conserved between the genes of both protein families, further supporting the idea of a common evolutionary origin of recent legumin and vicilin encoding genes.
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Correspondence to: H. Bäumlein
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Shutov, A.D., Kakhovskaya, I.A., Braun, H. et al. Legumin-like and vicilin-like seed storage proteins: Evidence for a common single-domain ancestral gene. J Mol Evol 41, 1057–1069 (1995). https://doi.org/10.1007/BF00173187
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DOI: https://doi.org/10.1007/BF00173187