title: Electrochemical redox titration of cofactors in the reaction center from Rhodobacter sphaeroides.
abstract: The electrochemical redox poising of the primary electron donor P and of the quinone electron acceptor(s) Q in isolated reaction centers from Rhodobacter sphaeroides in an ultra-thin-layer electrochemical cell, monitored by chronoamperometry and by spectroscopy in the visible/near-infrared region, is reported. Electrical application of a redox potential of +0.4 V (vs. Ag/AgCl/3 M KCl) leads to quantitative formation of the pi-cation radical of P within a few minutes. The oxidized product can be re-reduced to the neutral species by application of 0 V, and full reversibility is maintained over many cycles. By poising at a series of intermediate potentials, a titration curve for the 865 nm P band was obtained, which could be fitted to a Nernst function with Em = 0.485 vs. SHE and n = 0.96. By application of negative potentials (-0.2 V and -0.45 V vs. Ag/AgCl/3 M KCl), the quinone electron acceptors were reversibly reduced as demonstrated by the shift of bacteriopheophytin absorption and drastically changed kinetics of charge recombination. The use of this thin-layer electrochemical technique for the determination of midpoint potentials, for the investigation of redox-poised electron transfer reactions as well as for spectroscopy in the mid-infrared region is discussed.
authors.affiliation: Institut für Biophysik und Strahlenbiologie, Universität Freiburg, Germany.
authors.forename: D A
authors.initials: DA
authors.lastname: Moss
authors.forename: M
authors.initials: M
authors.lastname: Leonhard
authors.forename: M
authors.initials: M
authors.lastname: Bauscher
authors.forename: W
authors.initials: W
authors.lastname: Mäntele
mesh_terms: D004563:Electrochemistry; D004583:Electrons; D010084:Oxidation-Reduction; D045322:Photosynthetic Reaction Center Complex Proteins / Q000737:chemistry*; D012242:Rhodobacter sphaeroides / Q000378:metabolism*; D013057:Spectrum Analysis
chemical_list: D045322:Photosynthetic Reaction Center Complex Proteins