Generalized approach to the regulation and integration of gene expression

We demonstrated recently that regulation of PS gene expression in R. sphaeroides is closely coupled to the functional state of the cbb3 cytochrome c oxidase and the redox state of the quinone pool

Jeong-Il Oh; Samuel Kaplan

2004

Scholarcy highlights

  • The purple non-sulphur photosynthetic bacterium Rhodobacter sphaeroides grows by aerobic and anaerobic respiration, fermentation and anoxygenic photosynthesis
  • The photosynthetic apparatus of R. sphaeroides is housed in the specialized intracytoplasmic membrane system, whose formation is triggered by a reduction in O2 tension
  • The photosynthetic apparatus consists of two light-harvesting complexes, a photochemical reaction centre and various electron transport components
  • We demonstrated recently that regulation of PS gene expression in R. sphaeroides is closely coupled to the functional state of the cbb3 cytochrome c oxidase and the redox state of the quinone pool
  • On the basis of the currently available data, we suggest that the volume of electron flow through the cbb3 oxidase brings about a long-range conformational change in the cbb3 oxidase, which is perceived and transponded by the CcoQ subunit to the PrrBA two-component system through the membrane-localized PrrC polypeptide
  • Agents affecting the flow of reductant in and out of the quinone pool under anaerobic conditions in addition to light will have a marked effect upon PS gene expression and Bchl a levels

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