The Purple Phototrophic Bacteria

Volume 28 of the series Advances in Photosynthesis and Respiration pp 707-725

Regulation of Gene Expression in Response to Oxygen Tension

  • Carl E. BauerAffiliated withDepartment of Biology, Indiana University Email author 
  • , Aaron SetterdahlAffiliated withDepartment of Biology, Indiana University
  • , Jiang WuAffiliated withDepartment of Biology, Indiana University
  • , Brigitte R. RobinsonAffiliated withDepartment of Chemistry, Indiana University

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Purple photosynthetic bacteria control numerous energy-generating and energy-utilizing processes in response to alterations in cellular redox, which is affected by environmental oxygen tension. The list of redox-regulated events includes synthesis of the pigmented and cytochrome components of the photosystem, enzymes for fixation of carbon and nitrogen, the synthesis of several terminal respiratory electron transport complexes, and synthesis of the energy-generating hydrogenase complex. Regulating synthesis of these components involves several well-characterized transcription factors including the sensor kinase RegB and its cognate response regulator RegA. Other redox-responding regulators include CrtJ and Fnr. Mechanisms of redox sensing by these transcription factors are discussed.