Molecular cloning and expression in Escherichia coli of cDNA encoding the subunit of sweet potato beta-amylase.

Abstract

Tuberous roots of the sweet potato are unusually rich in beta-amylase, and the beta-amylase polypeptides account for about 5% of the total soluble protein of the organ. Unlike beta-amylases from other origins, the sweet potato beta-amylase is a tetramer of identical subunits, and it also bears starch phosphorylase-inhibitor activity. A cDNA for the subunit… (More)

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