Abstract
A protein phylogenetic tree was constructed from 24 homologous proteinase inhibitor I sequences identified in the EMBUGenbank and Swiss-Prot databases and from translated amino acid data from four constitutive cDNA clones of proteinase inhibitor I characterized from potato tuber mRNA. The tree suggests that divergence of at least four paralogous proteins with functional specialization occurred at different times during the evolutionary history of the proteinase inhibitor I family. Five distinct regions in the primary structure, earlier identified by structural studies, were used to analyze the inhibitor family for hypervariability (Creighton and Darby, Trends Biochem Sci 14:319–324, 1989). Mutations did not occur with higher-than-random frequency within the proteinase binding region. When isoinhibitor, orthologous, or paralogous data subsets were subsequently analyzed the same results were obtained. Comparison of the amino acid sequences for all the known potato proteinase isoinhibitor I proteins identified ten highly variable sites. These also were distributed randomly. Thus hypervariability, which has been observed in all other serine proteinase inhibitor families to date, appears to be lacking in the proteinase inhibitor I family.
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Beuning, L.L., Spriggs, T.W. & Christeller, J.T. Evolution of the proteinase inhibitor I family and apparent lack of hypervariability in the proteinase contact loop. J Mol Evol 39, 644–654 (1994). https://doi.org/10.1007/BF00160410
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DOI: https://doi.org/10.1007/BF00160410