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Quantitative model for the cooperative interaction of the bacteriorhodopsin molecules in purple membranes
Author(s) -
Tokaji Zsolt
Publication year - 1998
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(98)00120-3
Subject(s) - bacteriorhodopsin , molecule , membrane , chemistry , excited state , ground state , kinetic energy , chemical physics , halobacteriaceae , crystallography , physics , halobacterium salinarum , biochemistry , atomic physics , organic chemistry , quantum mechanics
The trimeric, asymmetric and sequential model for the cooperative interaction of the bacteriorhodopsin molecules in purple membranes [Zs. Tokaji, Biophys. J. 65 (1993) 1130–1134] is being extended in the paper. Analyses of data from absorption kinetic measurements with preexcitation and green background illumination, and photoselection measurements on oriented samples confirm the main features of this cooperative interaction and support the validity of the extended model. This model includes the observed heterogeneity of the non‐excited state of the bacteriorhodopsin molecules in purple membranes, and the agreement with the data suggests that molecules in any other state than the bacteriorhodopsin ground state can alter the photocycle of their neighbors. The presented results seem to contradict other models for the cooperation of the bacteriorhodopsin molecules.