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. 1991 Jan;57(1):45–50. doi: 10.1128/aem.57.1.45-50.1991

Cloning and DNA sequence analysis of an X-prolyl dipeptidyl aminopeptidase gene from Lactococcus lactis subsp. lactis NCDO 763.

M Nardi 1, M C Chopin 1, A Chopin 1, M M Cals 1, J C Gripon 1
PMCID: PMC182662  PMID: 1674656

Abstract

Lactococcus lactis subsp. lactis NCDO 763 (also designated ML3) possesses an X-prolyl dipeptidyl aminopeptidase (X-PDAP; EC 3.4.14.5). X-PDAP mutants were selected by an enzymatic plate assay on the basis of their inability to hydrolyze an L-phenylalanyl-L-proline-beta-naphthylamide substrate. A DNA bank from L. lactis subsp. lactis NCDO 763 was constructed in one of these X-PDAP mutants, and one clone in which the original X-PDAP phenotype was restored was detected by the enzymatic plate assay. The X-PDAP gene, designated pepXP, was further subcloned and sequenced. It codes for a protein containing 763 residues. Comparison of the amino-terminal sequence of the X-PDAP enzyme with the amino acid sequence deduced from the pepXP gene indicated that the enzyme is not subjected to posttranslational modification or exported via processing of a signal peptide. The pepXP gene from L. lactis subsp. lactis NCDO 763 in more than 99% homologous to the pepXP gene from L. lactis subsp. cremoris P8-2-47 described elsewhere (B. Mayo, J. Kok, K. Venema, W. Bockelmann, M. Teuber, H. Reinke, and G. Venema, Appl. Environ. Microbiol. 57:38-44, 1991) and is also conserved in other lactococcal strains.

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Selected References

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