Removal of N-terminal methionine from haemoglobin nascent peptides by a membrane-bound rat liver methionine aminopeptidase

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Abstract
A membrane-bound aminopeptidase able to remove methionine from haemoglobin nascent peptides is described. The enzyme also hydrolyses methionine from methionyl-lysyl-bradykinin but not lysine from lysyl-bradykinin. The tripeptide Met-Ala-Ser is poorly hydrolysed. This aminopeptidase also splits amino acid 2-naphthylamides, being, however, less specific with respect to these synthetic substrates.