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Structural Organization and Function of Polypeptide Subunits in Photosystem I

  • Barry D. Bruce
  • Richard Malkin
  • R. Max Wynn
  • April Zilber
Part of the NATO ASI Series book series (NSSA, volume 168)

Abstract

Photosystem I (PSI) is one of three multi-subunit complexes found in thylakoids of higher plants, algae and cyanobacteria.1 In conjunction with PSII and the cytochrome b 6 -f complex, electrons are transferred from H2O to NADP and accompanying this process, protons are translocated across the thylakoid membrane. This non-cyclic electron transfer system yields NADPH, O2 and a proton gradient, of which the latter is used for the synthesis of ATP. In the overall reaction from water to NADP, PSI catalyzes a light-dependent transfer of electrons between two mobile proteins, plastocyanin and ferredoxin.2,3 The PSI complex differs from PSII and most other photochemical reaction center complexes found in non-O2 evolving organisms in that PSI utilizes a bound electron complex which includes low-potential iron-sulfur centers.

Keywords

Antenna Complex Molecular Weight Subunit Polypeptide Subunit Subunit Stoichiometry Reaction Center Core 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1989

Authors and Affiliations

  • Barry D. Bruce
    • 1
  • Richard Malkin
    • 1
  • R. Max Wynn
    • 1
  • April Zilber
    • 1
  1. 1.Division of Molecular Plant BiologyUniversity of CaliforniaBerkeleyUSA

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