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Presence of proline residues in the second position of the N-terminus in peptides restricts the usage of many aminopeptidases; however, aminopeptidase P (APP) is capable of removing this blockage. Based on the N-terminal amino acid sequences of APP from Streptomyces lavendulae, app gene was cloned in pET28a(+) and over expressed as a His-tagged protein with a molecular weight of ≈60kDa in Escherichia...
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