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. 1992 Jan;58(1):285–290. doi: 10.1128/aem.58.1.285-290.1992

Localization of Peptidases in Lactococci

Paris S T Tan 1, Marie-Pierre Chapot-Chartier 1, Klaas M Pos 1, Micheline Rousseau 1, Clair-Yves Boquien 1, Jean-Claude Gripon 1, Wil N Konings 1,*
PMCID: PMC195205  PMID: 16348629

Abstract

The localization of two aminopeptidases, an X-prolyl-dipeptidyl aminopeptidase, an endopeptidase, and a tripeptidase in Lactococcus lactis was studied. Polyclonal antibodies raised against each purified peptidase are specific and do not cross-react with other peptidases. Experiments were performed by immunoblotting after cell fractionation and by electron microscopy of immunogold-labeled peptidases. All peptidases were found to be intracellular. However, immunogold studies showed a peripheral labeling of the X-prolyl-dipeptidyl aminopeptidase, the tripeptidase, and the endopeptidase. This peripheral location was further supported by the detection of these three enzymes in cell membrane fractions in which none of the two aminopeptidases was present.

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Selected References

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