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Plant and Cell Physiology, 1982, Vol. 23, No. 3 533-539
© 1982

Article

Inactivation of Photosynthetic Oxygen Evolution and Concomitant Release of Three Polypeptides in the Photosystem II Particles of Spinach Chloroplasts

Tomohiko Kuwabara1 and Norio Murata2

Department of Biology, University of Tokyo Komaba, Meguro-ku, Tokyo 153, Japan

2To whom correspondence and reprint requests should be addressed

Photosystem II particles having an oxygen evolution activity as high as 300 µmol mg–1 chlorophyll hr –1 were prepared from spinach chloroplasts using Triton X-100. The oxygen evolution system in these particles was stable; 70% of the original activity remained after storage of the particles at 0°C for 7 days. When the particles were treated at pH 9.3, the oxygen evolution was specifically inactivated and three polypeptides having apparent molecular weights of 32,000. 24,000 and 15,000 were simultaneously released. This observation suggests that these polypeptides are associated with the oxygen evolution system of photosynthesis.

1 Present address: Department of Chemistry, Faculty of Science, Toho University, Miyama 2-2-1, Funabashi, Chiba 274, Japan.

(Received January 4, 1982; Accepted February 19, 1982)
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