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Journal of Bacteriology, October 2001, p. 5617-5631, Vol. 183, No. 19
Institut für Mikrobiologie,
Ernst-Moritz-Arndt-Universität, 17487 Greifswald,1 Laboratorium für
Mikrobiologie, Philipps-Universität, and Max-Planck-Institut
für Terrestrische Mikrobiologie, 35043 Marburg,3 and Abteilung Theoretische
Bioinformatik4 and Abteilung
Funktionelle Genomanalyse,2 Deutsches
Krebsforschungszentrum Heidelberg, 69120 Heidelberg, Germany
Received 16 March 2001/Accepted 9 July 2001
Gene arrays containing all currently known open reading frames of
Bacillus subtilis were used to examine the general
stress response of Bacillus. By proteomics,
transcriptional analysis, transposon mutagenesis, and consensus
promoter-based screening, 75 genes had previously been described as
0021-9193/01/$04.00+0 DOI: 10.1128/JB.183.19.5617-5631.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Global Analysis of the General Stress Response of
Bacillus subtilis
B-dependent general stress genes. The present gene
array-based analysis confirmed 62 of these already known general stress
genes and detected 63 additional genes subject to control by the stress sigma factor
B. At least 24 of these 125
B-dependent genes seemed to be subject to a second,
B-independent stress induction mechanism. Therefore,
this transcriptional profiling revealed almost four times as many
regulon members as the proteomic approach, but failure of confirmation
of all known members of the
B regulon indicates that
even this approach has not yet elucidated the entire regulon. Most of
the
B-dependent general stress proteins are probably
located in the cytoplasm, but 25 contain at least one membrane-spanning
domain, and at least 6 proteins appear to be secreted. The functions of most of the newly described genes are still unknown. However, their
classification as
B-dependent stress genes argues that
their products most likely perform functions in stress management and
help to provide the nongrowing cell with multiple stress resistance. A
comprehensive screening program analyzing the multiple stress
resistance of mutants with mutations in single stress genes is in
progress. The first results of this program, showing the diminished
salt resistance of yjbC and yjbD mutants
compared to that of the wild type, are presented. Only a few new
B-dependent proteins with already known functions were
found, among them SodA, encoding a superoxide dismutase. In addition to
analysis of the
B-dependent general stress regulon, a
comprehensive list of genes induced by heat, salt, or ethanol stress in
a
B-independent manner is presented. Perhaps the most
interesting of the
B-independent stress phenomena was
the induction of the extracytoplasmic function sigma factor
W and its entire regulon by salt shock.
*
Corresponding author. Mailing address: Institut
für Mikrobiologie, Ernst-Moritz-Arndt-Universität
Greifswald, Friedrich-Ludwig-Jahn-Str. 15, 17487 Greifswald, Germany.
Phone: 49-3834-864200. Fax: 49-3834-864202. E-mail:
hecker{at}biologie.uni-greifswald.de.
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