Inactivation of Oxygen Evolution by Low pH-Treatment of Two Rice Photosystem II Preparations Containing One and Two Bound Ca2+

  • Jian-Ren Shen
  • Sakae Katoh

Abstract

Ca2+ is considered to function as a cofactor of PS II electron transport [1]. Oxygen-evolving PS II membranes prepared with Triton X-100 from higher plants contain two Ca2+ per PS II [2–4.] except for wheat preparations which have three Ca2+ per PS II [2]. The two Ca2+ are heterogeneous in terms of their binding stability; one Ca2+ can be readily extracted by various treatments while leaving another bound to the PS II membranes [2–5]. Ono and Inoue [5] have shown that a brief treatment of spinach PS II membranes at pH 3.0 results in a strong in-activation of oxygen evolution with a concomitant extraction of one of the two bound Ca2+. Because the activity was substantially restored upon addition of Ca2+, they suggested that the acid-extractable Ca2+ is essential for PS II electron transport.

Keywords

Oxygen Evolution Double Reciprocal Plot Mutant Complex Type Rice Chlorina Mutant 
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Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • Jian-Ren Shen
    • 1
  • Sakae Katoh
    • 1
  1. 1.Department of Biology, Faculty of ScienceUniversity of TokyoHongo, Bunkyo-ku, Tokyo 113Japan

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