Regulatory System for Light-Responsive Gene Expression in Photosynthesizing Bacteria : Cis-Elements and Trans-Acting Factors in Transcription and Post-Transcription
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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 <I>psbA</I> gene with <I>cis</I>-elements and <I>trans</I>-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.
- Agricultural and Biological Chemistry
Agricultural and Biological Chemistry 70(3), 565-573, 2006-03-23
Japan Society for Bioscience, Biotechnology, and Agrochemistry