Unusual growth phase and oxygen tension regulation of oxidative stress protection enzymes, catalase and superoxide dismutase, in the phytopathogen Xanthomonas oryzae pv. oryzae

Article Abstract:

Oxygen tension and growth phase control the enzymes catalase and superoxide dismutase in Xanthomonas species. Enzyme levels are optimum within 1h of growth, while the enzyme activities decrease as the growth continues. Enzyme activities are stimulated by high oxygen tension and major forms of the enzymes are an 80,000-Da monofunctional catalase and a manganese superoxide dismutase. Various Xanthomonas strains exhibit this unusual regulatory types and these patterns are vital during the initial stage of the interaction between plant and microorganisms.

Bacterial growth, Bacteria, Pathogenic, Pathogenic bacteria, Microbial enzymes

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Bacterial Ohr and OsmC paralogues define two protein families with distinct functions and patterns of expression

Article Abstract:

Escherichia coli OsmC, an osmotically inducible protein, the function of which is not known, and Xanthomonas campestris Ohr, a protein that has a role in organic peroxide protection, are related. They cluster in two related subfamilies of proteins widely distributed in Gram-negative/positive bacteria. Pseudomonas aeruginosa and Deinococcus radiodurans, each having one member of each subfamily, have been studied with the finding that bacterial OsmC and Ohr paralogues define two protein families having distinct patterns of expression and functions.

United Kingdom, Thailand, Statistical Data Included, Reports, Physiological aspects, Genetic aspects, Observations, Gene expression, Pseudomonas aeruginosa, Bacterial proteins, Microbiological research, Osmosis, Peroxides

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Analysis of heat shock gene expression in Lactococcus lactis MG1363

Article Abstract:

The heat shock response of dnaK, dnaJ, groEL, members of dnaK operon, and ftsH genes in Lactococcus lactis induces transcription of corresponding mRNA(s). Levels of mRNA in the first three show an increase for up to 15 minutes after heat shock, but decrease after 20 minutes. In orf1 and grpE, there is maximum induction within 10 minutes and it is maintained till after 15 minutes. There is a significant induction after 10 minutes in ftsH gene that is observed after 20 minutes. No induction is observed in orf4.

Genetic regulation

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