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Photosystem I

  1. Norbert Krauß,
  2. Wolfram Saenger

Published Online: 12 DEC 2001

DOI: 10.1038/npg.els.0000665



How to Cite

Krauß, N. and Saenger, W. 2001. Photosystem I. eLS. .

Author Information

  1. Freie Universität Berlin, Berlin, Germany

Publication History

  1. Published Online: 12 DEC 2001


In oxygenic photosynthesis, the two protein–pigment complexes photosystem I and photosystem II are involved in the light-driven charge separation across the thylakoid membrane, which results in the oxidation of water to O2 and in the reduction of NADP+ to NADPH. In addition to a photosynthetic reaction centre, each of these photosystems contains a core antenna system. The crystal structure of photosystem I reveals the spatial organization of protein subunits and cofactors.


  • photosystem I;
  • oxygenic photosynthesis;
  • electron transfer;
  • core antenna;
  • crystal structure