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. 1988 Jan;54(1):43–49. doi: 10.1128/aem.54.1.43-49.1988

Purification and Characterization of a Dipeptidase from Streptococcus cremoris Wg2

A van Boven 1, P S T Tan 1, W N Konings 1,*
PMCID: PMC202394  PMID: 16347537

Abstract

A dipeptidase was purified to homogeneity from a crude cell extract of Streptococcus cremoris Wg2 by DEAE-Sephacel column chromatography followed by preparative disc gel electrophoresis. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis of the purified enzyme showed a single protein band with a molecular weight of 49,000. The dipeptidase is capable of hydrolyzing a range of dipeptides, but not peptides with longer chains. The enzyme was shown to be a metallo-Mn2+ enzyme with a pH optimum of 8 and a temperature optimum of 50°C. The enzyme is strongly inhibited by thiol-reducing reagents but not by sulfhydryl reagents. Kinetic studies indicated that the enzyme has a relatively low affinity for leucyl-leucine and alanyl-alanine (Km, 1.6 and 7.9 mM, respectively) but can hydrolyze these substrates at very high rates (Vmax, 3,700 and 13,000 μmol/min per mg of protein, respectively).

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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