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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 : Research in microbiology

The metNPQ operon of Bacillus subtilis encodes an ABC permease transporting methionine sulfoxide, D- and L-methionine

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Research in microbiology - 01 Mar 2004

Hullo MF, Auger S, Dassa E, Danchin A, Martin-Verstraete I

Link to Pubmed [PMID] – 14990259

Res. Microbiol. 2004 Mar;155(2):80-6

The Bacillus subtilis yusCBA operon, which encodes an ABC-type transporter, contains an S-box motif in its promoter region. We showed that the expression of these genes is repressed via the S-box system when methionine is available. The YusCB proteins are involved in the transport of both d- and l-methionine but also methionine sulfoxide. A yusCB mutant is unable to grow in the presence of 5 microM l-methionine or 100 microM methionine sulfoxide, while it grows similarly to the wild type with 100 microM l-methionine and 1 mM methionine sulfoxide. Other uptake systems are therefore present for these two compounds. In contrast, the Yus ABC transporter corresponds to the sole d-methionine uptake system. We propose to rename yusC, yusB and yusA as metN, metP and metQ, respectively.

http://www.ncbi.nlm.nih.gov/pubmed/14990259