The dependence of the rate of transhydrogenase on the value of the protonmotive force in chromatophores from photosynthetic bacteria
[摘要] In conditions where the pH gradient is negligible, the rate of the pyridine nucleotide transhydrogenase in chromatophores of Rhodobacter capsulatus has a threshold dependence on membrane potential. The relationship is similar when either antimycin or myxothiazal or carbonyl cyanide p-trifluoromethoxyphenylhydrazone is used to depress the membrane potential. The relationship is distorted when membrane potential is reduced by lowering the photosynthetic light intensity.
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[效力级别] [学科分类] 生物化学/生物物理
[关键词] Transhydrogenase;Protonmotive force;Chromatophore;Photosynthetic bacteria;Chemiosmotic hypothesis;FCCP;carbonyl cyanide p-trifluoromethoxyphenylhydrazone;Δψ;bulk phase electric potential difference across the chromatophore membrane;ΔpH;bulk phase pH gradient across the chromatophore membrane;Δp;protonmotive force;J t;rate of the pyridine nucleotide transhydrogenase [时效性]
