Peptidases and amino acid catabolism in lactic acid bacteria

Jeffrey E. Christensen, Edward G. Dudley, Jeffrey A. Pederson, James L. Steele

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Abstract

The conversion of peptides to free amino acids and their subsequent utilization is a central metabolic activity in prokaryotes. At least 16 peptidases from lactic acid bacteria (LAB) have been characterized biochemically and/or genetically. Among LAB, the peptidase systems of Lactobacillus helveticus and Lactococcus lactis have been examined in greatest detail. While there are homologous enzymes common to both systems, significant differences exist in the peptidase complement of these organisms. The characterization of single and multiple peptidase mutants indicate that these strains generally exhibit reduced specific growth rates in milk compared to the parental strains. LAB can also catabolize amino acids produced by peptide hydrolysis. While the catabolism of amino acids such as Arg, Thr, and His is well understood, few other amino acid catabolic pathways from lactic acid bacteria have been characterized in significant detail. Increasing research attention is being directed toward elucidating these pathways as well as characterizing their physiological and industrial significance.

Original languageEnglish (US)
Pages (from-to)217-246
Number of pages30
JournalAntonie van Leeuwenhoek, International Journal of General and Molecular Microbiology
Volume76
Issue number1-4
DOIs
StatePublished - Sep 29 1999

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All Science Journal Classification (ASJC) codes

  • Microbiology
  • Molecular Biology

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