Abstract:
:Photosynthetic electron transfer has been examined in whole cells, isolated membranes and in partially purified reaction centers (RCs) of Roseicyclus mahoneyensis, strain ML6 and Porphyrobacter meromictius, strain ML31, two species of obligate aerobic anoxygenic phototrophic bacteria. Photochemical activity in strain ML31 was observed aerobically, but the photosynthetic apparatus was not functional under anaerobic conditions. In strain ML6 low levels of photochemistry were measured anaerobically, possibly due to incomplete reduction of the primary electron acceptor (Q(A)) prior to light excitation, however, electron transfer occurred optimally under low oxygen conditions. Photoinduced electron transfer involves a soluble cytochrome c in both strains, and an additional reaction center (RC)-bound cytochrome c in ML6. The redox properties of the primary electron donor (P) and Q(A) of ML31 are similar to those previously determined for other aerobic phototrophs, with midpoint redox potentials of +463 mV and -25 mV, respectively. Strain ML6 showed a very narrow range of ambient redox potentials appropriate for photosynthesis, with midpoint redox potentials of +415 mV for P and +94 mV for Q(A). Cytoplasm soluble and photosynthetic complex bound cytochromes were characterized in terms of apparent molecular mass. Fluorescence excitation spectra revealed that abundant carotenoids not intimately associated with the RC are not involved in photosynthetic energy conservation.
journal_name
Photosynth Resjournal_title
Photosynthesis researchauthors
Rathgeber C,Alric J,Hughes E,Verméglio A,Yurkov Vdoi
10.1007/s11120-011-9718-1subject
Has Abstractpub_date
2012-02-01 00:00:00pages
193-203issue
3eissn
0166-8595issn
1573-5079journal_volume
110pub_type
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journal_title:Photosynthesis research
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pub_type: 传,历史文章,杂志文章
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