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Biophys. J. BioFAST: First Published August 5, 2005. doi:10.1529/biophysj.105.066431
© 2005 by the Biophysical Society.

A more recent version of this article appeared on October 1, 2005.
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PHOTOBIOPHYSICS

Actinic light-energy dependence of proton release from bacteriorhodopsin

Rudolf Tóth-Boconádi 1, Stefka Germanova Taneva 2 and Lajos Keszthelyi 1*

1 Institute of Biophysics, Biological Research Centre
2 Institute of Biophysics, Bulgarian Academy of Sciences

* To whom correspondence should be addressed. E-mail: kl{at}nucleus.szbk.u-szeged.hu.

Submitted on May 27, 2005
Revised on June 21, 2005
Accepted on 14 July 2005


  Abstract
Measuring the light-density (fluence) dependence of proton release from flash excited bacteriorhodopsin with two independent methods we found that the lifetime of proton release increases and the proton pumping activity, defined as a number of protons per number of photocycle, decreases with increasing fluence. An interpretation of these results, based on bending of purple membrane and electrical interaction among the proton release groups of bacteriorhodopsin trimer, is presented.

Key Words: Charge motion, Orientation, Proton release group, Purple membrane, Structure of bacteriorhodopsin






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Copyright © 2005 by the Biophysical Society.