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Comparison of bacterial reaction centers and photosystem II

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Abstract

In photosynthetic organisms, the utilization of solar energy to drive electron and proton transfer reactions across membranes is performed by pigment–protein complexes including bacterial reaction centers (BRCs) and photosystem II. The well-characterized BRC has served as a structural and functional model for the evolutionarily-related photosystem II for many years. Even though these complexes transfer electrons and protons across cell membranes in analogous manners, they utilize different secondary electron donors. Photosystem II has the unique ability to abstract electrons from water, while BRCs use molecules with much lower potentials as electron donors. This article compares the two complexes and reviews the factors that give rise to the functional differences. Also discussed are the modifications that have been performed on BRCs so that they perform reactions, such as amino acid and metal oxidation, which occur in photosystem II.

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Abbreviations

BChl:

Bacteriochlorophyll monomer

BPheo:

Bacteriopheophytin

BRC:

Bacterial reaction center

Chl:

Chlorophyll

EPR:

Electron paramagnetic resonance

P:

Special pair of bacteriochlorophylls, primary electron donor of BRC

PSII:

Photosystem II

P680:

Primary electron donor of PSII

pK a :

Negative logarithm of the proton dissociation constant

Rb:

Rhodobacter

YZ and YD :

Redox active tyrosine residues of PSII

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Acknowledgment

Our work is supported by the National Science Foundation, grant MCB0640002.

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  1. Department of Physics, Concordia University, Montreal, QC, Canada, H4B 1R6

    László Kálmán

  2. Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ, 85287-1604, USA

    JoAnn C. Williams & James P. Allen

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Kálmán, L., Williams, J.C. & Allen, J.P. Comparison of bacterial reaction centers and photosystem II. Photosynth Res 98, 643–655 (2008). https://doi.org/10.1007/s11120-008-9369-z

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