M-DECAY IN THE BACTERIORHODOPSIN PHOTOCYCLE - EFFECT OF COOPERATIVITY AND PH

被引：20

作者：

KOMRAKOV, AY ^{[1
]}

KAULEN, AD ^{[1
]}

机构：

[1] MOSCOW MV LOMONOSOV STATE UNIV,AN BELOZERSKY INST PHYSICOCHEM BIOL,MOSCOW 119899,RUSSIA

来源：

BIOPHYSICAL CHEMISTRY | 1995年 / 56卷 / 1-2期

基金：

俄罗斯基础研究基金会;

关键词：

BACTERIORHODOPSIN; PHOTOCYCLE; PROTON TRANSPORT; COOPERATIVITY; PURPLE MEMBRANE; HALOBACTERIUM HALOBIUM;

D O I：

10.1016/0301-4622(95)00022-P

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

The dependence of the bacteriorhodopsin (bR) photocycle on the intensity of the exciting flash was investigated in purple membranes. The dependence was most pronounced at slightly alkaline pH values. A comparison study of the kinetics of the photocycle and proton uptake at different intensities of the flash suggested that there exist two parallel photocycles in purple membranes at a high intensity of the flash. The photocycle of excited bR in a trimer with the two other bR molecules nonexcited is characterized by an almost irreversible M --> N transition. Excitation of two or three bR in a trimer induces the N --> M back reaction and accelerates the N --> bR transition. Based on the qualitative similarity of the pH dependencies of the photocycles of solubilized bR and excited dimers and trimers we proposed that the interaction of nonexcited bR in trimers alters the photocycle of the excited monomer as compared to solubilized bR and the changes in the photocycles in excited dimers and trimers are the result of decoupling of this interaction.

引用

页码：113 / 119

页数：7

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