FEBS Letters
Volume 580, Issue 1 , Pages 319-323, 9 January 2006

The SigB σ factor mediates high-temperature responses in the cyanobacterium Synechocystis sp. PCC6803

Edited by Richard Cogdell

Plant Physiology and Molecular Biology, Department of Biology, University of Turku, FI-20014 Turku, Finland

Received 28 October 2005; received in revised form 25 November 2005; accepted 29 November 2005. published online 14 December 2005.

Abstract 

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.

Abbreviations: Chl, chlorophyll, PPFD, photosynthetic photon flux density

Keywords: Cyanobacterium, Sigma (σ) factor, Heat shock, sigB gene, sigD gene

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PII: S0014-5793(05)01471-7

doi:10.1016/j.febslet.2005.11.082

FEBS Letters
Volume 580, Issue 1 , Pages 319-323, 9 January 2006

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