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The SigB σ factor mediates high‐temperature responses in the cyanobacterium Synechocystis sp. PCC6803
Author(s) -
Tuominen Ilona,
Pollari Maija,
Tyystjärvi Esa,
Tyystjärvi Taina
Publication year - 2006
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2005.11.082
Subject(s) - sigma factor , synechocystis , rna polymerase , heat shock , strain (injury) , biology , bacteria , cyanobacteria , shock (circulatory) , gene , heat shock protein , rna , microbiology and biotechnology , genetics , anatomy , medicine
The σ 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 σ factor inactivation strains ΔsigB, ΔsigD and ΔsigBD. 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 σ factor had a role in high‐temperature responses as well, and the double inactivation strain ΔsigBD grew more slowly at 43 °C than the ΔsigB and ΔsigD strains.