Acid tolerance in Listeria monocytogenes: the adaptive acid tolerance response (ATR) and growth-phase-dependent acid resistance

Article Abstract:

Gram-positive bacterium Listeria monocytogenes develop acid tolerance under conditions of sublethal acid stress by a mechanism termed as acid tolerance response (ATR). However, cells first undergo a period of maximal acid resistance at pH values ranging from 4-6 prior to the development of acid tolerance. Expression of ATR involves the activation of certain genes encoding a variety of proteins. L. monocytogenes also exhibits ATR during the stationary phase upon exposure to acid stress, but the mechanism is independent of pH.

Microbial growth, Listeria monocytogenes

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A comparison of the kinetics of plasmid transfer in the conjugation systems encoded by the F plasmid from Escherichia coli and plasmid pCF10 from Enterococcus faecalis

Article Abstract:

A comparison of the conjugation systems of F plasmid from Escherichia coli and plasmid pCF10 from Enterococcus faecalis using data from the aggregation-mediated conjugation system encoded from Bacillus thuringiensis' pXO16 reveals a number of common characteristics despite the obvious basic differences. One common characteristic shared by the two plasmids include their ability to sustain highly efficient conjugative transfers in a liquid environment.

Research, Genetic aspects, Escherichia coli, Plasmids, Bacterial genetics, Conjugation (Biology), Conjugation (Reproduction)

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The penicillin resistance of enterococcus faecalis JH2-2r results from an overproduction of the low-affinity penicillin-binding protein PBP4 and does not involve a psr-like gene

Article Abstract:

Results show that the overproduction of the low-affinity penicillin-binding protein PBP4 in Enterococcus faecalis JH2-2r can be ascertained by an intense benzylpenicillin labeling of PBP4 in JH2-2r compared to other strains. PBP4 overproduction is due to a modification of an unidentifiable factor other than psr-like gene.

Belgium, Protein binding, Enterococcus, Penicillin, Penicillins

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