Theory of Triplet Excitation Transfer in the Donor-Oxygen-Acceptor System: Application to Cytochrome b6f.
Theoretical consideration is presented of the triplet excitation dynamics in donor-acceptor systems in conditions where the transfer is mediated by an oxygen molecule. It is demonstrated that oxygen may be involved in both real and virtual intramolecular triplet-singlet conversions in the course of the process under consideration. Expressions describing a superexchange donor-acceptor coupling owing to a participation of the bridging twofold degenerate oxygen's virtual singlet state are derived and the transfer kinetics including the sequential (hopping) and coherent (distant) routes are analyzed. Applicability of this theoretical description to the pigment-protein complex cytochrome b6f, by considering the triplet excitation transfer from the chlorophyll a molecule to distant β-carotene, is discussed.
Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine, Kiev, Ukraine.
Elmar G
EG
Petrov
Nuclear Research Center Saclay, UMR 8221 Centre National de la Recherche Scientifique, Institut de Biologie et de Technologie de Saclay, University Paris Sud, Gif sur Yvette, France.
Bruno
B
Robert
National Chiao Tung University, Hsinchu, Taiwan.
Sheng Hsien
SH
Lin
Theoretical Physics Department, Vilnius University, Vilnius, Lithuania; Center for Physical Sciences and Technology, Vilnius, Lithuania. Electronic address: leonas.valkunas@ff.vu.lt.
Leonas
L
Valkunas
D045346:Cytochrome b6f Complex / Q000737:chemistry*; D004735:Energy Transfer; D007700:Kinetics; D008958:Models, Molecular; D010100:Oxygen / Q000737:chemistry*; D019207:beta Carotene / Q000737:chemistry
D019207:beta Carotene; D045346:Cytochrome b6f Complex; D010100:Oxygen