Biology of Photosystem I: Structural aspects

  • Petra Fromme
Chapter

Summary

The primary step in oxygenic photosynthesis, the light induced charge separation, is driven in plants and cyanobacteria by two large membrane intrinsic protein complexes, the Photosystems I and II. Photosystem I catalyzes the light driven electron transfer from plastocyanin/cytochrome c6 at the lumenal side to ferredoxin at the stromal side of the thylakoid membrane by a chain of—at least six—electron carriers. Photosystem I of cyanobacteria consists of 11 protein subunits, about 100 chlorophyll a molecules, 20–25 carotenoids, 3 [4Fe4S] clusters and 2 phylloquinones. It exists as a trimer in the native membrane with a molecular weight of 1000 kDa for the whole complex. Information concerning the structure of Photosystem I is available from the use of several different techniques. Biochemical data, biophysical investigations as well as results from electron microscopy and X-ray structure analysis are summarized in this chapter in order to provide the readers with an overview of the structure of this large membrane protein. Its structural organization is discussed here with respect to the structure/function relationship.

Keywords

Reaction Center Photo System Transmembrane Helix Purple Bacterium Green Sulfur Bacterium 
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Copyright information

© Springer Science+Business Media Dordrecht 1999

Authors and Affiliations

  • Petra Fromme
    • 1
  1. 1.Max-Volmer-Institut für Biophysikalische Chemie und BiochemieTechnical University BerlinBerlinGermany

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