title: The Spx paralogue MgsR (YqgZ) controls a subregulon within the general stress response of Bacillus subtilis.
abstract: The alternative sigma factor sigma(B) of Bacillus subtilis is responsible for the induction of the large general stress regulon comprising approximately 150-200 genes. YqgZ, a member of the sigma(B) regulon, resembles the global regulator Spx of the diamide stress regulon in B. subtilis. In this work we conducted a comprehensive transcriptome and proteome analysis of the B. subtilis wild-type 168 and its isogenic DeltasigB and DeltayqgZ mutants following exposure to 4% (v/v) ethanol stress, which led to the characterization of a 'subregulon' within the general stress response that is regulated by YqgZ. Activation and induction of sigma(B) are necessary but not sufficient for a full expression of all general stress genes. Expression of 53 genes was found to be positively regulated and the expression of 18 genes was negatively affected by YqgZ. The identification of the negatively regulated group represents a so far uncharacterized regulatory phenomenon observed in the DeltasigB mutant background that can now be attributed to the function of YqgZ. Due to the strict sigma(B)-dependent expression of YqgZ it was renamed to MgsR (modulator of the general stress response).
authors.affiliation: Institut für Mikrobiologie, Ernst-Moritz-Arndt-Universität, D-17487 Greifswald, Germany. alexander.reder@uni-greifswald.de
authors.forename: Alexander
authors.initials: A
authors.lastname: Reder
authors.forename: Dirk
authors.initials: D
authors.lastname: Höper
authors.forename: Christin
authors.initials: C
authors.lastname: Weinberg
authors.forename: Ulf
authors.initials: U
authors.lastname: Gerth
authors.forename: Martin
authors.initials: M
authors.lastname: Fraunholz
authors.forename: Michael
authors.initials: M
authors.lastname: Hecker
mesh_terms: D000595:Amino Acid Sequence; D019943:Amino Acid Substitution; D001412:Bacillus subtilis / Q000737:chemistry / Q000187:drug effects / Q000235:genetics / Q000502:physiology*; D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D015180:Electrophoresis, Gel, Two-Dimensional; D000431:Ethanol / Q000494:pharmacology; D020869:Gene Expression Profiling; D015964:Gene Expression Regulation, Bacterial / Q000187:drug effects; D008969:Molecular Sequence Data; D018384:Oxidative Stress / Q000187:drug effects; D018085:Regulon; D012097:Repressor Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D016415:Sequence Alignment; D012808:Sigma Factor / Q000235:genetics / Q000378:metabolism
chemical_list: D001426:Bacterial Proteins; D012097:Repressor Proteins; D012808:Sigma Factor; D000431:Ethanol