Succession of Co-factors in Photosystem I

  • Shunsuke Ohashi
  • Tohru Tsuchiya
  • Koji Iwamoto
  • Hideaki Miyashita
  • Tadashi Watanabe
  • Yoshihiro Shiraiwa
  • Mamoru Mimuro
  • Masami Kobayashi
Conference paper

Abstract

The succession of co-factors in PS I-type reaction centers (RCs) from anoxygenic photosynthesis into oxygenic photosynthesis was considered from the viewpoint of the molecular\ structures. In the PS I-type RCs, BChl g succeeded to Chl a. The epimers of BChl g and Chl a, BChl g' and Chl a', function as the primary electron donors in respective organisms. In Acaryochloris marina PS I, Chl d' function as the primary electron donor. The primary electron acceptors of PS I, A0, are Chl a derivatives even in anoxygenic photosynthesis. The secondary electron acceptors in the PS I-type RCs, A1, are naphtoquinone molecules, and side chains are modified after the origin of cyanobacteria, leading to succession from menaquinone to phylloquinone in oxygenic organisms. Note that change in quinone did not occur in accordance with the origin of oxygenic photosynthesis, but an intermediary organisms, such as in the cyanobacterium Gloeobacter violaceus PCC 7421, would give an idea for the succession.

Keywords

Acaryochloris marina bacteriochlorophyll g chlorophyll a chlorophyll d Gloeobacter violaceus heliobacteria 

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Copyright information

© Springer Science + Business Media, B.V. 2008

Authors and Affiliations

  • Shunsuke Ohashi
    • 1
  • Tohru Tsuchiya
    • 2
  • Koji Iwamoto
    • 3
  • Hideaki Miyashita
    • 2
  • Tadashi Watanabe
    • 4
  • Yoshihiro Shiraiwa
    • 3
  • Mamoru Mimuro
    • 2
  • Masami Kobayashi
    • 1
  1. 1.Institute of Materials ScienceUniversity of TsukubaTsukubaJapan
  2. 2.Department of Technology and EcologyHall of global Environmental Research, and Graduate School of Human and Environmental Studies, Kyoto UniversityKyotoJapan
  3. 3.Institute of Industrial ScienceUniversity of TokyoKomabaJapan
  4. 4.Institute of Biological SciencesUniversity of TsukubaTsukubaJapan

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