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© Michel-Robert Popoff
Clostridium difficile en microscopie à contraste de phase. On distingue des bactéries sporulées, non sporulées et d'autres en cours de lyse (destruction). Bactérie de l'environnement (sol, eau, foin, sable), elle est à l'origine d'infections nosocomiales survenant après un traitement antibiotique : Clostridium difficile prédomine alors que les autres bactéries de la flore intestinale ont été détruites. L'infection peut provoquer deux types de pathologies graves : les colites pseudo-membraneuses dont l'origine est quasiment due à 100 % à C. difficile et la diarrhée post-antibiothérapie due à C. difficile dans 30 % des cas de ces diarrhées.
Publication : FEMS microbiology letters

Complex phenotypes of a mutant inactivated for CymR, the global regulator of cysteine metabolism in Bacillus subtilis

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in FEMS microbiology letters - 17 Jun 2010

Hullo MF, Martin-Verstraete I, Soutourina O

Link to Pubmed [PMID] – 20608979

FEMS Microbiol. Lett. 2010 Aug;309(2):201-7

We characterized various phenotypes of a mutant inactivated for CymR, the master regulator of cysteine metabolism in Bacillus subtilis. The deletion of cymR resulted in impaired growth in the presence of cystine and increased sensitivity to hydrogen peroxide-, disulfide-, paraquat- and tellurite-induced stresses. Estimation of metabolite pools suggested that these phenotypes could be the result of profound metabolic changes in the DeltacymR mutant including an increase of the intracellular cysteine pool and hydrogen sulfide formation, as well as a depletion of branched-chain amino acids.

http://www.ncbi.nlm.nih.gov/pubmed/20608979