The seeds of Phaseolus vulgaris contain an inhibitor of alpha-amylase, which is identified in the protein fraction of the bean.

The inhibitor is the protein molecule composed of two glycosylated protomers of 30 kDa, whcih are cleaved into tow polypeptides of 16 and 14 kDa, respectively. The protein binds with the active sites of alpha-amylase and prevents the starch metabolizing activity; hence it is also called as "Starch Blocker".

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