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An aminopeptidase gene fragment was isolated from a keratin-degrading strain, Streptomyces fradiae var. k11, by PCR amplification using a degenerate primer set designed based on the partial amino acid sequence of the native enzyme. The gene, designated sfap, encoded a polypeptide of 461 amino acids comprised of three domains: a signal peptide, a mature region, and a C-terminal propeptide. The aminopeptidase,...
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