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.
KeywordsCysteine Respiration Photosynthesis Pseudomonas Quinone
nuclear magnetic resonance
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- Bolton JR (1978) Primary electron acceptor. In: Clayton RK and Sistrom WR (ed) The Photosynthetic Bacteria, pp 419–429. Plenum Press, New YorkGoogle Scholar
- Giraud E, Zappa S, Jaubert M, Hannibal L, Fardoux J, Adriano JM, Bouyer P, Genty B, Pignol D and Verméglio A (2004) Bacteriophytochrome and regulation of the synthesis of the photosynthetic apparatus in Rhodopseudomonas palustris: Pitfalls of using laboratory strains. Photochem Photobiol Sci 3: 587–591PubMedCrossRefGoogle Scholar
- Hemschemeier SK, Ebel U, Jager A, Balzer A, Kirndorfer M and Klug G (2000) In vivo and in vitro analysis of RegA response regulator mutants of Rhodobacter capsulatus. J Mol Microbiol Biotech 2: 291–300Google Scholar
- Madigan MT (1995) The microbiology of nitrogen fixation by anoxygenic photosynthetic bacteria, In: Blankenship RE, Madigan MT and Bauer CE (ed) Anoxygenic Photosynthetic Bacteria (Advances in Photosynthesis and Respiration, Vol 2), pp 915–928. Kluwer Academic Publishing, DordrechtGoogle Scholar
- Masuda S, Matsumoto Y, Nagashima KVP, Shimada K, Inoue K, Bauer CE and Matsuura K (1999) Structural and functional analyses of photosynthetic regulatory genes regA and regB from Rhodovulum sulfidophilum, Roseobacter denitrificans, and Rhodobacter capsulatus. J Bacteriol 181: 4205–4215PubMedGoogle Scholar
- Parson W (1978) Quinones as secondary electron acceptor, In: RK Clayton and Sistrom WR (ed) The Photosynthetic Bacteria, pp 455–469. Plenum Press, New YorkGoogle Scholar
- Pfenning N (1978) General physiology and ecology of photosynthetic bacteria, In: RK Clayton and Sistrom WR (ed) The Photosynthetic Bacteria, pp 1–18. Plenum Press, New YorkGoogle Scholar
- Tabita FR (1995) The biochemistry and metabolic regulation of carbon metabolism and CO2 fixation in purple bacteria. In: Blankenship RE, Madigan MT and Bauer CE (ed) Anoxygenic Photosynthetic Bacteria (Advances in Photosynthesis and Respiration, Vol 2), pp 885–914. Kluwer Academic Publishing, DordrechtGoogle Scholar
- Willett J, Smart JL and Bauer CE (2007) RegA controls synthesis of bacteriochlorophyll and carotenoid photopigments in Rhodobacter capsulatus. J Bacteriol, In PressGoogle Scholar