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Journal of Bacteriology, March 2001, p. 1740-1747, Vol. 183, No. 5
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.5.1740-1747.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Functional Elements of the Strong psbAI Promoter of Synechococcus elongatus PCC 7942

Usha Nair, Colleen Thomas, and Susan S. Golden*

Department of Biology, Texas A&M University, College Station, Texas 77843-3258

Received 8 August 2000/Accepted 13 December 2000

The psbAI gene of the cyanobacterium Synechococcus elongatus PCC 7942 is one of three psbA genes that encode a critical photosystem II reaction center protein, D1. Regulation of the gene family in response to changes in the light environment is complex, occurs at transcriptional and posttranscriptional levels, and results in an interchange of two different forms of D1 in the membrane. Expression of psbAI is downregulated under high-intensity light (high light) in contrast to induction of the other two family members. We show that, in addition to a known accelerated degradation of the psbAI message, promoter activity decreases upon exposure to high light. Unlike the other psbA genes, additional sequences upstream of the psbAI -35 element are required for expression. Mutagenizing the atypical psbAI -10 element from TCTCCT to TATAAT increased the magnitude of expression from both psbAI::lacZ and psbAI::luxAB fusions but did not affect downregulation under high light. Inactivation of group 2 sigma factor genes rpoD2 and sigC, in both wild-type and -10-element mutagenized backgrounds, resulted in elevated psbAI::luxAB expression but did not alter the response to high light. The results are consistent with redundancy of promoter recognition among cyanobacterial group 2 sigma factors. Electrophoretic mobility shift assays showed that the DNA sequence corresponding to the untranslated leader of the psbAI message binds one or more proteins from an S. elongatus extract. The corresponding region of psbAII efficiently competed for this binding activity, suggesting a shared regulatory factor among these disparately regulated genes.

* Corresponding author. Mailing address: Department of Biology, Texas A&M University, 3258 TAMU, College Station, TX 77843-3258. Phone: (979) 845-9824. Fax: (979) 862-7659. E-mail: sgolden{at}tamu.edu.

Journal of Bacteriology, March 2001, p. 1740-1747, Vol. 183, No. 5
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.5.1740-1747.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


This article has been cited by other articles:

  • Muramatsu, M., Hihara, Y. (2007). Coordinated High-Light Response of Genes Encoding Subunits of Photosystem I Is Achieved by AT-Rich Upstream Sequences in the Cyanobacterium Synechocystis sp. Strain PCC 6803. J. Bacteriol. 189: 2750-2758 [Abstract] [Full Text]  
  • Stelljes, C., Koenig, F. (2007). Specific Binding of D1 Protein Degradation Products to the psbAI Promoter in Synechococcus sp. Strain PCC 7942. J. Bacteriol. 189: 1722-1726 [Abstract] [Full Text]  
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