The dependence of the rate of transhydrogenase on the value of the protonmotive force in chromatophores from photosynthetic bacteria

FEBS Letters

Myatt, J.F.¹  Cotton, N.P.J.¹  Jackson, J.B.¹ 

[1] Department of Biochemistry, University of Birmingham, PO Box 363, Birmingham B15 2TT, England

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;   

DOI  :  10.1016/0014-5793(87)81196-1

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 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.

【 授权许可】

Unknown