IMR Press / FBL / Volume 9 / Issue 1 / DOI: 10.2741/1236

Frontiers in Bioscience-Landmark (FBL) is published by IMR Press from Volume 26 Issue 5 (2021). Previous articles were published by another publisher on a subscription basis, and they are hosted by IMR Press on imrpress.com as a courtesy and upon agreement with Frontiers in Bioscience.

Open Access Article

Proton and electron transfer in the acceptor quinone complex of photosynthetic reaction centers from Rhodobacter sphaeroides

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1 Department of Biochemistry and Center for Biophysics & Computational Biology, MC–147, University of Illinois, 607 South Mathews Avenue, Urbana, IL 61801, USA
Academic Editor:Michael Green
Front. Biosci. (Landmark Ed) 2004, 9(1), 309–337; https://doi.org/10.2741/1236
Published: 1 January 2004
(This article belongs to the Special Issue Proton transport in biological systems)
Abstract

For twenty years the photosynthetic reaction center (RC) has been the premier testing ground for theoretical understanding of electron transfer in aperiodic systems, with special, but not unique, reference to long distance biological electron transport. In addition to the known structure, many of the attributes that make RCs so well suited to studying electron transfer function equally well for any charge movement, including protons. These include the presence of intrinsic reporter groups (electrochromically active pigments), high time resolution through light activation, and a large number and variety of distinct reactions, ranging from loosely coupled responses of the protein dielectric to specific, long distance proton transfers in and out of active sites, and bond making in terminal chemical transformations. A wide variety of biophysical methods have been coupled with site directed mutagenesis to reveal mechanisms of proton uptake, transfer and chemistry in the RC. This review summarizes our progress to date, which suggests that the RC can serve as a paradigm, not only for many energy coupled, membrane proteins, but for the electrostatic and dielectric properties of proteins that are critical to their general function.

Keywords
Photosynthetic Reaction Centers
Proton Transfer
Electrron Transfer
Quinones
Rba. sphaeroides
Review
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