title: Correlation of membrane-potential-sensing carotenoid to pigment-protein complex II in Rhodopseudomonas sphaeroides.
abstract: The changes in carotenoid absorbance induced by illumination or by a diffusion potential were larger in chromatophores from cells cultured under low light intensity than those in chromatophores from high-light culture in a photosynthetic bacterium, Rhodopseudomonas sphaeroides. The carotenoid molecules which are associated with the pigment-protein complex (with the infrared bacteriochlorophyll peaks at 800 and 850 nm) (complex II) probably respond to the electrical field changes in the chromatophore membrane.
mesh_terms: D020130:Bacterial Chromatophores / Q000528:radiation effects; D001426:Bacterial Proteins / Q000378:metabolism; D001429:Bacteriochlorophylls / Q000378:metabolism; D002338:Carotenoids / Q000378:metabolism / Q000528:radiation effects*; D008027:Light; D008564:Membrane Potentials / Q000187:drug effects / Q000528:radiation effects; D011189:Potassium Chloride / Q000494:pharmacology; D012242:Rhodobacter sphaeroides / Q000378:metabolism*; D013055:Spectrophotometry, Infrared
chemical_list: D001426:Bacterial Proteins; D001429:Bacteriochlorophylls; D002338:Carotenoids; D011189:Potassium Chloride