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  Purple Bacteria: Photosynthetic Reaction Centers

Lancaster, C. R. D. (2004). Purple Bacteria: Photosynthetic Reaction Centers. In W. J. Lennarz (Ed.), Encyclopedia of Biological Chemistry (pp. 586-594). Academic Press, Elsevier.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0024-DAC1-A Version Permalink: https://hdl.handle.net/21.11116/0000-0006-F254-A
Genre: Book Chapter

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 Creators:
Lancaster, C. Roy D.1, Author           
Affiliations:
1Department of Molecular Membrane Biology, Max Planck Institute of Biophysics, Max Planck Society, ou_2068290              

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 Abstract: Located within photosynthetic membranes, reaction centers (RCs) are defined as the minimal functional units that cancatalyze light-induced electron transfer reactions, thus stabilizing the separation of charged species across the membrane. The RC essentially functions as a ferrocytochrome c2:quinone photo-oxidoreductase. The absorption of two photons of light leads to two one-electron oxidations of cytochrome c2 in the periplasm and to the two-electron reduction of a quinone, which is coupled to the uptake of two protons from the cytoplasm. The resulting quinol then leaves its binding site, diffuses in the photosynthetic membrane and is reoxidized by a second membrane protein complex, the cytochrome bc1 complex, which results in proton release to the periplasm. The electrons are transferred to re-reduce the cytochrome c2 in the periplasm. This net proton transport produces a trans-membrane electrochemical proton potential that can drive ATP synthesis through a third membrane-spanning complex, the ATP synthase.

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Language(s): eng - English
 Dates: 2004
 Publication Status: Issued
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/B0-12-443710-9/00571-8
 Degree: -

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Title: Encyclopedia of Biological Chemistry
Source Genre: Multi-Volume
 Creator(s):
Lennarz, William J.1, Editor
Lane, M. Daniel2, Author
Affiliations:
1 State University of New York at Stony Brook, Stony Brook, New York, USA, ou_persistent22            
2 The Johns Hopkins University, School of Medicine, Baltimore, Maryland, USA, ou_persistent22            
Publ. Info: Academic Press, Elsevier
Pages: - Volume / Issue: 3 Sequence Number: - Start / End Page: 586 - 594 Identifier: ISBN: 978-0-12-443710-4