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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 : Journal of bacteriology

CotA of Bacillus subtilis is a copper-dependent laccase

Team: Group: Isabelle Martin-Verstraete
Team: Pathogenesis of Bacterial Anaerobes
Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Journal of bacteriology - 01 Sep 2001

Hullo MF, Moszer I, Danchin A, Martin-Verstraete I

Link to Pubmed [PMID] – 11514528

J. Bacteriol. 2001 Sep;183(18):5426-30

The spore coat protein CotA of Bacillus subtilis displays similarities with multicopper oxidases, including manganese oxidases and laccases. B. subtilis is able to oxidize manganese, but neither CotA nor other sporulation proteins are involved. We demonstrate that CotA is a laccase. Syringaldazine, a specific substrate of laccases, reacted with wild-type spores but not with DeltacotA spores. CotA may participate in the biosynthesis of the brown spore pigment, which appears to be a melanin-like product and to protect against UV light.