Abstract

The primary structure of the chymotrypsin inhibitor (SCI-III), from larvae of the silkworm, Bombyx mori, has been determined. This inhibitor seems to be a Kunitz-type inhibitor judging from the sequence homology with the bovine basic pancreatic trypsin inhibitor, but has one more amino acid in the half-cystine frame nearest the N-terminus. The amino acid at the deduced reactive site (P 1) is phenylalanine and this inhibitor is the first example of the Kunitz type that is assigned phenylalanine to its reactive site.

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