title: The anti-anti-sigma factor BldG is involved in activation of the stress response sigma factor σ(H) in Streptomyces coelicolor A3(2).
abstract: The alternative stress response sigma factor σ(H) has a role in regulation of the osmotic stress response and in morphological differentiation in Streptomyces coelicolor A3(2). Its gene, sigH, is located in an operon with the gene that encodes its anti-sigma factor UshX (PrsH). However, no gene with similarity to an anti-anti-sigma factor which may have a role in σ(H) activation by a "partner-switching" mechanism is located in the operon. By using a combination of several approaches, including pull-down and bacterial two-hybrid assays and visualization of the complex by native polyacrylamide electrophoresis, we demonstrated a direct interaction between UshX and the pleiotropic sporulation-specific anti-anti-sigma factor BldG. Osmotic induction of transcription of the sigHp2 promoter that is specifically recognized by RNA polymerase containing σ(H) was absent in an S. coelicolor bldG mutant, indicating a role of BldG in σ(H) activation by a partner-switching-like mechanism.
authors.affiliation: Institute of Molecular Biology, Slovak Academy of Sciences, Dubravska cesta 21, 845 51 Bratislava, Slovak Republic.
authors.forename: Beatrica
authors.initials: B
authors.lastname: Sevcikova
authors.forename: Bronislava
authors.initials: B
authors.lastname: Rezuchova
authors.forename: Dagmar
authors.initials: D
authors.lastname: Homerova
authors.forename: Jan
authors.initials: J
authors.lastname: Kormanec
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D012321:DNA-Directed RNA Polymerases / Q000378:metabolism; D004926:Escherichia coli; D015964:Gene Expression Regulation, Bacterial / Q000502:physiology*; D009154:Mutation; D009997:Osmotic Pressure; D010957:Plasmids; D011401:Promoter Regions, Genetic; D012808:Sigma Factor / Q000235:genetics / Q000378:metabolism*; D048372:Streptomyces coelicolor / Q000235:genetics / Q000378:metabolism*; D013312:Stress, Physiological / Q000502:physiology*; D014158:Transcription, Genetic; D020798:Two-Hybrid System Techniques
chemical_list: D001426:Bacterial Proteins; D012808:Sigma Factor; D012321:DNA-Directed RNA Polymerases
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