title: The SigB sigma factor mediates high-temperature responses in the cyanobacterium Synechocystis sp. PCC6803.
abstract: The sigma factors of RNA polymerase play central roles when bacteria adapt to different environmental conditions. We studied heat-shock responses in the cyanobacterium Synechocystis sp. PCC6803 using the sigma factor inactivation strains deltasigB, deltasigD and deltasigBD. The SigB factor was found to be important for short-term heat-shock responses and acquired thermotolerance. The normal high-temperature induction of the hspA gene depended on the SigB factor. The SigD sigma factor had a role in high-temperature responses as well, and the double inactivation strain deltasigBD grew more slowly at 43 degrees C than the deltasigB and deltasigD strains.
authors.affiliation: Plant Physiology and Molecular Biology, Department of Biology, University of Turku, FI-20014 Turku, Finland.
authors.forename: Ilona
authors.initials: I
authors.lastname: Tuominen
authors.forename: Maija
authors.initials: M
authors.lastname: Pollari
authors.forename: Esa
authors.initials: E
authors.lastname: Tyystjärvi
authors.forename: Taina
authors.initials: T
authors.lastname: Tyystjärvi
mesh_terms: D000222:Adaptation, Physiological / Q000235:genetics*; D001426:Bacterial Proteins / Q000096:biosynthesis* / Q000235:genetics* / Q000378:metabolism; D017353:Gene Deletion; D006360:Heat-Shock Proteins / Q000096:biosynthesis* / Q000235:genetics; D006358:Hot Temperature; D012808:Sigma Factor / Q000235:genetics* / Q000378:metabolism; D046939:Synechocystis / Q000235:genetics* / Q000254:growth & development
chemical_list: D001426:Bacterial Proteins; D006360:Heat-Shock Proteins; C113725:HspA protein, bacteria; C079011:SigB protein, Bacteria; D012808:Sigma Factor