Chapter

Mechanism of Charge Separation in Purple Bacterial Reaction Centers

12/2007; DOI:10.1007/978-1-4020-8815-5_19 pp.355-377

ABSTRACT This chapter discusses the pathway, kinetics and energetics of the initial electron-transfer steps in reaction centers (RCs)
from purple photosynthetic bacteria. We consider the unusual dependence of the kinetics on temperature, the strong specificity
of the reactions for electron acceptors on the ‘A’ side of the RC, effects of vibrational wavepackets, the multiphasic nature
of the kinetics, effects of mutations and pigment substitutions, and links between the kinetics of electron transfer and vibrational
equilibration. We then discuss some of the theories that have been used to rationalize the dynamics and temperature dependence
of the electron-transfer reactions, including Marcus theory, coupling to quantized vibrational modes and density-matrix treatments.
Our discussion illustrates the power of microscopic simulations for connecting structural information with mechanistic interpretations.

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Keywords

chapter discusses
 
coupling
 
electron-transfer reactions
 
energetics
 
initial electron-transfer steps
 
kinetics
 
links
 
Marcus theory
 
mechanistic interpretations
 
microscopic simulations
 
multiphasic nature
 
purple photosynthetic bacteria
 
quantized vibrational modes
 
RCs
 
reaction centers
 
reactions
 
strong specificity
 
structural information