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Plant and Cell Physiology, 1985, Vol. 26, No. 2 383-388
© 1985

Short Communication

Molecular Sizes of the Catalytic Units of Oxygen Evolution and the Reaction Center in Photosystem II of Spinach Thylakoids

Masa-aki Takahashi, Jun-ichi Mano and Kozi Asada

The Research Institute for Food Science, Kyoto University Uji, Kyoto 611, Japan

Target analysis of the PS II reaction in spinach thylakoids showed that the respective molecular masses of the catalytic units for oxygen evolution and the reaction center are about 120 kDa and 250 kDa based on a kinetic separation of the two reaction rates. The size of the oxygen-evolving enzyme agreed with that determined for the PS II preparation from a thermophilic cyanobacterium by the same means [Nugent and Atkinson (1984) FEBS Lett. 170: 89]. Single hit-inactivation of oxygen evolution and the PS II reaction center units indicates that each function is driven by a structurally assembled unit.

(Received August 6, 1984; Accepted December 17, 1984)
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