THE PH-DEPENDENCE OF THE SUBPICOSECOND RETINAL PHOTOISOMERIZATION PROCESS IN BACTERIORHODOPSIN - EVIDENCE FOR PARALLEL PHOTOCYCLES

Authors
SONG L LOGUNOV SL YANG DF ELSAYED MA
Citation
L. Song et al., THE PH-DEPENDENCE OF THE SUBPICOSECOND RETINAL PHOTOISOMERIZATION PROCESS IN BACTERIORHODOPSIN - EVIDENCE FOR PARALLEL PHOTOCYCLES, Biophysical journal, 67(5), 1994, pp. 2008-2012
Citations number
35
Categorie Soggetti
Biophysics
Journal title
Biophysical journal → ACNP
ISSN journal
00063495
Volume
67
Issue
5
Year of publication
1994
Pages
2008 - 2012
Database
ISI
SICI code
0006-3495(1994)67:5<2008:TPOTSR>2.0.ZU;2-2
Abstract
The pH dependence of the subpicosecond decay of the retinal photoexcit ed state in bacteriorhodopsin (bR) is determined in the pH range 6.8-1 1.3. A rapid change in the decay rate of the retinal photoexcited stat e is observed in the pH range 9-10, the same pH range in which a rapid change in the M(412) formation kinetics was observed. This observatio n supports the previously proposed heterogeneity model in which parall el photocycles contribute to the observed pH dependence of the M(412) formation kinetics in bR.