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Biosci Biotechnol Biochem. 2006 Mar;70(3):565-73.

Regulatory system for light-responsive gene expression in photosynthesizing bacteria: cis-elements and trans-acting factors in transcription and post-transcription.

Author information

1
Laboratory of Molecular Genetics, Ibaraki University, Japan. asam@mx.ibaraki.ac.jp

Abstract

Cyanobacteria (blue-green algae) are photosynthesizing organisms that can be used as a model for analyzing light-responsive gene expression. The regulatory system of the light-responsive psbA gene with cis-elements and trans-acting factors was studied at both transcriptional and post-transcriptional levels. Positive regulation comprises DNA curvatures (CIT and RIB), upstream elements (UPE and promoter), and a light-induced sigma factor (SigD) of RNA polymerase in transcription. On the other hand, negative regulation involves mRNA instability through an AU-box under darkness. This two-step process is a candidate for a novel mechanism regulating light-responsive gene expression.

PMID:
16556970
DOI:
10.1271/bbb.70.565
[Indexed for MEDLINE]
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