Primary photochemistry of reaction centers from the photosynthetic purple bacteria |
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Authors: | Christine Kirmaier Dewey Holten |
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Institution: | (1) Department of Chemistry, Washington University, 63130 St. Louis, MO, USA |
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Abstract: | Photosynthetic organisms transform the energy of sunlight into chemical potential in a specialized membrane-bound pigment-protein complex called the reaction center. Following light activation, the reaction center produces a charge-separated state consisting of an oxidized electron donor molecule and a reduced electron acceptor molecule. This primary photochemical process, which occurs via a series of rapid electron transfer steps, is complete within a nanosecond of photon absorption. Recent structural data on reaction centers of photosynthetic bacteria, combined with results from a large variety of photochemical measurements have expanded our understanding of how efficient charge separation occurs in the reaction center, and have changed many of the outstanding questions.Abbreviations BChl
bacteriochlorophyll
- P
a dimer of BChl molecules
- BPh
bacteriopheophytin
- QA and QB
quinone molecules
- L, M and H
light, medium and heavy polypeptides of the reaction center |
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Keywords: | electron transfer bacterial photosynthesis reaction center |
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