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. 1994 May 15;300(Pt 1):15–19. doi: 10.1042/bj3000015

Identification, purification and partial characterization of a carboxypeptidase from the matrix of rat liver mitochondria: a novel metalloenzyme.

E Figueiredo 1, M C Duque-Magalhães 1
PMCID: PMC1138115  PMID: 8198527

Abstract

A novel carboxypeptidase has been purified to apparent homogeneity from the matrix fraction of rat liver mitochondria by using a procedure mainly based on immobilized-metal-affinity chromatography (IMAC). This carboxypeptidase has been named mCP-III, since it represents the third major peak of carboxypeptidase activity after the IMAC step of purification. mCP-III hydrolyses a number of N-blocked dipeptides, with preference for Cbz-Phe-Ala, and shows no degrading activity towards 125I-casein. The optimal pH of its activity is 7.6, the apparent Km for Cbz-Phe-Ala is 0.12 mM and the specific activity is 145.5 mumol/min per mg of protein. The enzyme is a typical metalloproteinase, is inhibited by 1,10-phenanthroline and carboxypeptidase inhibitor and re-activated by added Zn2+ and Co2+. The molecular mass estimated by molecular-sieve h.p.l.c. was approx. 115 kDa with two protein bands of 61 and 50 kDa shown by SDS/PAGE analysis, indicating that the enzyme is active as a dimer. This is the first clearly identified carboxypeptidase within mitochondria.

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Selected References

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