Photochemical reaction cycle of bacteriorhodopsin
- Univ. of California, Irvine, CA (United States)
The complex spectroscopic transformations during the reaction cycle of the light-driven proton pump, bacteriorhodopsin, are satisfactorily explained with a single-photoreaction scheme, which contains reversible reactions. The proposed model, derived by fitting time-resolved difference spectra, is BR {yields}{sup hv} K {leftrightarrow} L {leftrightarrow} M{sub 1} {yields} M{sub 2} {leftrightarrow} N {leftrightarrow} O {yields} BR. Some of these reactions are correlated with retinal bond motions, others with proton transfers internal and external to the protein. Thermodynamic analysis indicates that mechanistic coupling to proton potential is at the M{sub 1} {yields} M{sub 2} step, which also functions as the switch that confers direction to the net proton translocation. 92 refs., 5 figs.
- OSTI ID:
- 588732
- Report Number(s):
- CONF-910812-; CNN: Grant GM 29498; Grant NAGW-212; TRN: 98:001295-0002
- Resource Relation:
- Conference: 202. national meeting of the American Chemical Society (ACS), New York, NY (United States), 25-30 Aug 1991; Other Information: PBD: 1994; Related Information: Is Part Of Molecular and biomolecular electronics; Birge, R.R. [ed.]; PB: 585 p.
- Country of Publication:
- United States
- Language:
- English
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