Specificity of Milk Peptide Utilization by Lactococcus Lactis

Overview

Journal Appl Environ Microbiol

Specialties Environmental Health
Microbiology

Date 1998 Apr 18

PMID 9546157

Citations 14

Authors

V Juillard

A Guillot

D LE Bars

J C Gripon

Affiliations

Soon will be listed here.

Abstract

To study the substrate specificity of the oligopeptide transport system of Lactococcus lactis for its natural substrates, the growth of L. lactis MG1363 was studied in a chemically defined medium containing milk peptides or a tryptic digest of alpha s2-casein as the source of amino acids. Peptides were separated into acidic, neutral, and basic pools by solid-phase extraction or by cation-exchange liquid chromatogrpaphy. Their ability to sustain growth and the time course of their utilization demonstrated the preferential use of hydrophobic basic peptides with molecular masses ranging between 600 and 1,100 Da by L. lactis MG1363 and the inability to use large, acidic peptides. These peptide utilization preferences reflect the substrate specificity of the oligopeptide transport system of the strain, since no significant cell lysis was inferred. Considering the free amino acid content of milk and these findings on peptide utilization, it was demonstrated that the cessation of growth of L. lactis MG1363 in milk was due to deprivation of leucine and methionine.

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