Substituents at the c(13) position of retinal and their influence on the function of bacteriorhodopsin.
Retinal analogues in which the 13-methyl group is replaced by H, C(2)H(5), CF(3), and OCH(3) residues are studied by means of quantumchemical modified neglect of diatomic overlap-correlated version (MNDOC) calculations. The analogues are suitable to test the stereochemical mechanism of proton pumping in bacteriorhodopsin. The results explain the proton-pumping activities of bacterio-opsin reconstituted with these analogues and elucidate the decisive role of retinal's ground-state intramolecular properties in the pump cycle of bacteriorhodopsin.
P
P
Tavan
K
K
Schulten
W
W
Gärtner
D
D
Oesterhelt