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Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Carotenoid response to retinal excitation and photoisomerization dynamics in xanthorhodopsin

Author

  • Vaclav Slouf
  • Sergei P. Balashov
  • Janos K. Lanyi
  • Tönu Pullerits
  • Tomas Polivka

Summary, in English

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. (C) 2011 Elsevier B.V. All rights reserved.

Department/s

  • Chemical Physics

Publishing year

2011

Language

English

Pages

96-101

Publication/Series

Chemical Physics Letters

Volume

516

Issue

1-3

Document type

Journal article

Publisher

Elsevier

Topic

  • Atom and Molecular Physics and Optics

Status

Published

ISBN/ISSN/Other

  • ISSN: 0009-2614