Regulation of Gene Expression in Response to Oxygen Tension
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.
KeywordsRhodobacter Sphaeroides Rhodobacter Capsulatus Redox Control Rhodopseudomonas Palustris Purple Photosynthetic Bacterium
nuclear magnetic resonance
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