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Spectral position of the main absorption band of the pigment complex p 870 and kinetics of photo induced oxidation reductions in reaction centers and chromatophores of purple bacteria at different temperatures and hydration conditions


Molekulyarnaya Biologiya (Moscow) 11(4): 933-940
Spectral position of the main absorption band of the pigment complex p 870 and kinetics of photo induced oxidation reductions in reaction centers and chromatophores of purple bacteria at different temperatures and hydration conditions
In the isolated photosynthetic reaction centers of Rhodopseudomonas sphaeroides and chromatophores Rhodospirillum rubrum, the spectral position of the longest wavelength absorption band on P870, the effectiveness of electron removal from the photochemical pair (P870.sbd.primary electron acceptor, A1) and the rate constant for recombination of photooxidized P870 with photoreduced A1 undergo marked and fully reversible changes over the temperature interval from 20 to -70.degree. C. Dehydration of the samples has the effect similar to that induced by temperature lowering. The spectral position of the main maximum of pigment complex P870 absorption band may be regarded as a sensitive inner probe of the structural-functional state of the investigated preparations.


Accession: 006459744



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