The role of peptide metabolism in the growth of Listeria monocytogenes ATCC 23074 at high osmolarity

Article Abstract:

A study of the effect of osmotic stress on the physiology of Listeria monocytogenes through an analysis of the osmoprotectants that enable growth of the pathogen at high salt levels reveals that the introduction of a peptone into the medium activates the growth of L. monocytogenes at high osmolarity at a growth rate similar to that of glycine betaine. Peptides with proline have a similar effect on growth at high osmolarity. Peptides that are involved in osmoregulation are collected in high concentrations during growth at high and low osmolarities in L. monocytogenes.

Physiological aspects, Growth, Peptides, Fluid-electrolyte balance, Osmoregulation

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A di- and tripeptide transport system can supply Listeria monocytogenes scott A with amino acids essential for growth

Article Abstract:

Examination of the growth of Listeria monocytogenes reveals that the di- and tripeptide permeases transport the essential amino acids required for the growth. This proton motive force-dependent di- and tripeptide transport system facilitates growth of this pathogens in different foods where proteolytic activity of the microorganisms supplies these peptides. The correlation of this transport system with osmoregulation and virulence of L. monocytogenes is analyzed.

Bacterial growth, Biological transport

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Modifications of membrane phospholipid composition in nisin-resistant Listeria monocytogenes Scott A

Article Abstract:

Microbiological research shows that the 34-amino-acid polypeptide bacteriocin Nisin penetrates the lipid monolayers of diphosphatidylglycerol more than phosphatidylglycerol, phosphatidylcholine, phosphatidylethanolamine, monogalactosyldiacylglycerol and digalactosyldiacylglycerol lipids. Evidence suggests that nisin resistance in the microorganism Listeria monocytogenes is caused by a reduction in diphosphatidylglycerol in the cytoplasmic membrane.

Lipid membranes, Bilayer lipid membranes

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