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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 : BMC systems biology

Reconstruction and analysis of the genetic and metabolic regulatory networks of the central metabolism of Bacillus subtilis

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in BMC systems biology - 26 Feb 2008

Goelzer A, Bekkal Brikci F, Martin-Verstraete I, Noirot P, Bessières P, Aymerich S, Fromion V

Link to Pubmed [PMID] – 18302748

BMC Syst Biol 2008;2:20

BACKGROUND: Few genome-scale models of organisms focus on the regulatory networks and none of them integrates all known levels of regulation. In particular, the regulations involving metabolite pools are often neglected. However, metabolite pools link the metabolic to the genetic network through genetic regulations, including those involving effectors of transcription factors or riboswitches. Consequently, they play pivotal roles in the global organization of the genetic and metabolic regulatory networks.

RESULTS: We report the manually curated reconstruction of the genetic and metabolic regulatory networks of the central metabolism of Bacillus subtilis (transcriptional, translational and post-translational regulations and modulation of enzymatic activities). We provide a systematic graphic representation of regulations of each metabolic pathway based on the central role of metabolites in regulation. We show that the complex regulatory network of B. subtilis can be decomposed as sets of locally regulated modules, which are coordinated by global regulators.

CONCLUSION: This work reveals the strong involvement of metabolite pools in the general regulation of the metabolic network. Breaking the metabolic network down into modules based on the control of metabolite pools reveals the functional organization of the genetic and metabolic regulatory networks of B. subtilis.

http://www.ncbi.nlm.nih.gov/pubmed/18302748