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A stationary-phase stress-response sigma factor from Mycobacterium tuberculosis.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Demaio, J. Young, D. B. Bishai, W. R. Zhang, Y. Ko, C.
Description	Author Affiliation: DeMaio J ( Department of Molecular Microbiology and Immunology, Johns Hopkins School of Hygiene and Public Health, Baltimore, MD 21205, USA.);
Abstract	Alternative RNA polymerase sigma factors are a common means of coordinating gene regulation in bacteria. Using PCR amplification with degenerate primers, we identified and cloned a sigma factor gene, sigF, from Mycobacterium tuberculosis. The deduced protein encoded by sigF shows significant similarity to SigF sporulation sigma factors from Streptomyces coelicolor and Bacillus subtilis and to SigB, a stress-response sigma factor, from B. subtilis. Southern blot surveys with a sigF-specific probe identified cross-hybridizing bands in other slow-growing mycobacteria, Mycobacterium bovis bacille Calmette-Guérin (BCG) and Mycobacterium avium, but not in the rapid-growers Mycobacterium smegmatis or Mycobacterium abscessus. RNase protection assays revealed that M. tuberculosis sigF mRNA is not present during exponential-phase growth in M. bovis BCG cultures but is strongly induced during stationary phase, nitrogen depletion, and cold shock. Weak expression of M. tuberculosis sigF was also detected during late-exponential phase, oxidative stress, anaerobiasis, and alcohol shock. The specific expression of M. tuberculosis sigF during stress or stationary phase suggests that it may play a role in the ability of tubercle bacilli to adapt to host defenses and persist during human infection.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	7
Volume Number	93
Language	English
Publisher	National Academy of Sciences
Publisher Date	1996-05-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Mycobacterium Tuberculosis Physiology Sigma Factor Biosynthesis Amino Acid Sequence Bacillus Subtilis Genetics DNA Primers Molecular Sequence Data Mycobacterium Bovis Growth & Development Oxidative Stress Polymerase Chain Reaction RNA, Messenger Restriction Mapping Sequence Homology, Amino Acid Chemistry Streptomyces Comparative Study Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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