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Journal of Bacteriology, March 2009, p. 1581-1586, Vol. 191, No. 5
0021-9193/09/$08.00+0     doi:10.1128/JB.01588-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.

The Response Regulator RpaB Binds to the Upstream Element of Photosystem I Genes To Work for Positive Regulation under Low-Light Conditions in Synechocystis sp. Strain PCC 6803{triangledown}

Yurie Seino, Tomoko Takahashi, and Yukako Hihara*

Department of Biochemistry and Molecular Biology, Faculty of Science, Saitama University, 255 Shimo-okubo, Saitama 338-8570, Japan

Received 10 November 2008/ Accepted 5 December 2008

The coordinated high-light response of genes encoding subunits of photosystem I (PSI) is achieved by the AT-rich region located just upstream of the core promoter in Synechocystis sp. strain PCC 6803. The upstream element enhances the basal promoter activity under low-light conditions, whereas this positive regulation is lost immediately after the shift to high-light conditions. In this study, we focused on a high-light regulatory 1 (HLR1) sequence included in the upstream element of every PSI gene examined. A gel mobility shift assay revealed that a response regulator RpaB binds to the HLR1 sequence in PSI promoters. Base substitution in the HLR1 sequence or decrease in copy number of the rpaB gene resulted in decrease in the promoter activity of PSI genes under low-light conditions. These observations suggest that RpaB acts as a transcriptional activator for PSI genes. It is likely that RpaB binds to the HLR1 sequence under low-light conditions and works for positive regulation of PSI genes and for negative regulation of high-light-inducible genes depending on the location of the HLR1 sequence within target promoters.

* Corresponding author. Mailing address: Department of Biochemistry and Molecular Biology, Faculty of Science, Saitama University, 255 Shimo-okubo, Saitama 338-8570, Japan. Phone: 81-48-858-3396. Fax: 81-48-858-3384. E-mail: hihara{at}molbiol.saitama-u.ac.jp

{triangledown} Published ahead of print on 12 December 2008.

Journal of Bacteriology, March 2009, p. 1581-1586, Vol. 191, No. 5
0021-9193/09/$08.00+0     doi:10.1128/JB.01588-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.





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