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  • Title: Purification and characterization of L-phenylalanine aminopeptidase from chick-pea cotyledons (Cicer arietinum L.).
    Author: Marinova M, Dolashki A, Altenberend F, Stevanovic S, Voelter W, Tchorbanov B.
    Journal: Protein Pept Lett; 2009; 16(2):207-12. PubMed ID: 19200046.
    Abstract:
    Chick-pea (Cicer arietinum L.) cotyledons are unique source of aminopeptidase - 8-9 U/g cotyledons was observed using L-leucine-p-nitroanilide as substrate. The aminopeptidase was purified (65 kDa, pI 4.8 ) reaching a specific activity of 220 U/mg at pH 7.0-7.2 and 35-40 degrees C. The determined constant of specificity k(cat)/K(m) during hydrolysis of N-unsubstituted amino acid-p-nitroanilides showed a decrease order: Phe>Leu>Pro>Ile>Val>Ala. The enzyme was strongly inhibited by p-chloromercuribenzoic acid as well as in a competitive rate by the antihypertensive peptides Ile-Pro-Pro and Val-Pro-Pro.
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