Control of photosystem formation in Rhodobacter sphaeroides.
نویسندگان
چکیده
منابع مشابه
Responses of the Rhodobacter sphaeroides transcriptome to blue light under semiaerobic conditions.
Exposure to blue light of the facultative phototrophic proteobacterium Rhodobacter sphaeroides grown semiaerobically results in repression of the puc and puf operons involved in photosystem formation. To reveal the genome-wide effects of blue light on gene expression and the underlying photosensory mechanisms, transcriptome profiles of R. sphaeroides during blue-light irradiation (for 5 to 135 ...
متن کاملIdentification and in vivo characterization of PpaA, a regulator of photosystem formation in Rhodobacter sphaeroides.
A regulatory protein, PpaA, involved in photosystem formation in the anoxygenic phototrophic proteobacterium Rhodobacter sphaeroides has been identified and characterized in vivo. Based on the phenotypes of cells expressing the ppaA gene in extra copy and on the phenotype of the ppaA null mutant, it was concluded that PpaA activates photopigment production and puc operon expression under aerobi...
متن کاملAbsence of a bicarbonate-depletion effect in electron transfer between quinones in chromatophores and reaction centers of Rhodobacter sphaeroides.
Higher plants, algae, and cyanobacteria are known to require bicarbonate ions for electron flow from the first stable electron acceptor quinone QA to the second electron acceptor quinone QB, and to the intersystem quinone pool. It has been suggested that in Photosystem II of oxygenic photosynthesis, bicarbonate ion functions to maintain the reaction center in a proper conformation and, perhaps,...
متن کاملAppA Is a Blue Light Photoreceptor that Antirepresses Photosynthesis Gene Expression in Rhodobacter sphaeroides
Photosynthetic bacteria regulate photosystem synthesis in response to alterations in oxygen tension and light intensity. In this study we show that the PpsR repressor from Rhodobacter sphaeroides binds to DNA in a redox-dependent manner through the formation/breakage of an intramolecular disulfide bond. We also demonstrate that PpsR is antagonized by the flavin-containing antirepressor, AppA, t...
متن کاملRadical Pair Quantum Yield in Reaction Centers of Photosystem II of Green Plants and of the Bacterium Rhodobacter sphaeroides. Saturation Behavior with Sub-picosecond Pulses
We have measured the radical pair quantum yield of reaction centers of photosystem II of green plants and of the purple bacterium Rhodobacter sphaeroides as a function of excitation density using sub-picosecond pulses at 77 K. The saturation behavior of both RCs can be described consistently by taking into account stimulated emission and the geometry of the polarized (magic angle) laser experim...
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ورودعنوان ژورنال:
- Journal of bacteriology
دوره 180 11 شماره
صفحات -
تاریخ انتشار 1998