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J. Bacteriol., Oct 1995, 5561-5566, Vol 177, No. 19
S Colombo, G Toietta, L Zecca, M Vanoni and P Tortora
Mammalian metallocarboxypeptidases play key roles in major biological
processes, such as digestive-protein degradation and specific proteolytic
processing. A Sulfolobus solfataricus gene (cpsA) encoding a recently
described zinc carboxypeptidase with an unusually broad substrate
specificity was cloned, sequenced, and expressed in Escherichia coli.
Despite the lack of overall sequence homology with known carboxypeptidases,
seven homology blocks, including the Zn- coordinating and catalytic
residues, were identified by multiple alignment with carboxypeptidases A,
B, and T. S. solfataricus carboxypeptidase expressed in E. coli was found
to be enzymatically active, and both its substrate specificity and
thermostability were comparable to those of the purified S. solfataricus
enzyme.
Copyright © 1995, American Society for Microbiology
Molecular cloning, nucleotide sequence, and expression of a carboxypeptidase-encoding gene from the archaebacterium Sulfolobus solfataricus
Dipartimento di Fisiologia e Biochimica Generali, Universita degli Studi di Milano, Italy.
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