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Femtosecond absorption spectroscopy of light-adapted and dark-adapted bacteriorhodopsin

✍ Scribed by J.W. Petrich; J. Breton; J.L. Martin; A. Antonetti

Publisher: Elsevier Science
Year: 1987
Tongue: English
Weight: 621 KB
Volume: 137
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(87)80902-8

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✦ Synopsis

Using tunable femtosecond laser pulses, we report the first measurements of the kinetics of formation of the initial photoproducts of dark-adapted bacteriorhodopsin (approximately 50% all-trans and 50% 13-cis, 15-cis retinal) and compare these results with those obtained for light-adapted bacteriorhodopsin (all-trans retinal). We find that for both light-adapted and dark-adapted bacteriorhodopsin, the initial photoproducts are formed with the same time constants. These results are discussed in terms of the photophysics of bacteriorhodopsin and the mechanism of formation of its photoproducts.

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