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Mechanism of Charge Separation in Purple Bacterial Reaction Centers

  • Chapter
The Purple Phototrophic Bacteria

Part of the book series: Advances in Photosynthesis and Respiration ((AIPH,volume 28))

Summary

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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Abbreviations

BA, BB :

monomeric BChls that serve as electron acceptors in the RC

BChl:

bacteriochlorophyll

BPhe:

bacteriopheophytin

HA, HB :

BPhes that serve as electron acceptors

MD:

molecular dynamics

P:

the special pair of BChls that acts as the primary electron donor

Pheo:

pheophytin

RC:

reaction center

UV:

ultra-violet

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Authors and Affiliations

  1. Department of Biochemistry, University of Washington, Box 357350, Seattle, WA, 98195-7350, USA

    William W. Parson

  2. Department of Chemistry, University of Southern California, Los Angeles, CA, 90007, USA

    Arieh Warshel

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  1. University of Sheffield, UK

    C. Neil Hunter

  2. University of Pennsylvania, USA

    Fevzi Daldal

  3. Argonne National Laboratory, USA

    Marion C. Thurnauer

  4. University of British Columbia, Canada

    J. Thomas Beatty

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Parson, W.W., Warshel, A. (2009). Mechanism of Charge Separation in Purple Bacterial Reaction Centers. In: Hunter, C.N., Daldal, F., Thurnauer, M.C., Beatty, J.T. (eds) The Purple Phototrophic Bacteria. Advances in Photosynthesis and Respiration, vol 28. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-8815-5_19

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