Abstract:
:Clostridium difficile, a proteolytic Gram-positive anaerobe, has emerged as a significant nosocomial pathogen. Stickland fermentation reactions are thought to be important for growth of C. difficile and appear to influence toxin production. In Stickland reactions, pairs of amino acids donate and accept electrons, generating ATP and reducing power in the process. Reduction of the electron acceptors proline and glycine requires the d-proline reductase (PR) and the glycine reductase (GR) enzyme complexes, respectively. Addition of proline in the medium increases the level of PR protein but decreases the level of GR. We report the identification of PrdR, a protein that activates transcription of the PR-encoding genes in the presence of proline and negatively regulates the GR-encoding genes. The results suggest that PrdR is a central metabolism regulator that controls preferential utilization of proline and glycine to produce energy via the Stickland reactions.
journal_name
J Bacterioljournal_title
Journal of bacteriologyauthors
Bouillaut L,Self WT,Sonenshein ALdoi
10.1128/JB.01492-12subject
Has Abstractpub_date
2013-02-01 00:00:00pages
844-54issue
4eissn
0021-9193issn
1098-5530pii
JB.01492-12journal_volume
195pub_type
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更新日期:1984-07-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
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journal_title:Journal of bacteriology
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更新日期:2003-03-01 00:00:00