title: Carotenoid response to retinal excitation and photoisomerization dynamics in xanthorhodopsin.
abstract: We present a comparative study of xanthorhodopsin, a proton pump with the carotenoid salinixanthin serving as an antenna, and the closely related bacteriorhodopsin. Upon excitation of retinal, xanthorhodopsin exhibits a wavy transient absorption pattern in the region between 470 and 540 nm. We interpret this signal as due to electrochromic effect of the transient electric field of excited retinal on salinixanthin. The spectral shift decreases during the retinal dynamics through the ultrafast part of the photocycle. Differences in dynamics of bacteriorhodopsin and xanthorhodopsin are discussed.
authors.affiliation: Institute of Physical Biology, University of South Bohemia, Zámek 136, 373 33 Nové Hrady, Czech Republic.
authors.forename: Václav
authors.initials: V
authors.lastname: Slouf
authors.forename: Sergei P
authors.initials: SP
authors.lastname: Balashov
authors.forename: Janos K
authors.initials: JK
authors.lastname: Lanyi
authors.forename: Tõnu
authors.initials: T
authors.lastname: Pullerits
authors.forename: Tomáš
authors.initials: T
authors.lastname: Polívka
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