Electron Transfer from the Water Oxidizing Complex at Cryogenic

Department of Biology, Darwin Building, University College London, Gower Street, ... Site-directed Mutations at D1-Thr179 of Photosystem II in Synecho...
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Biochemistry 2002, 41, 4117-4126

4117

Electron Transfer from the Water Oxidizing Complex at Cryogenic Temperatures: The S1 to S2 Step† Jonathan H. A. Nugent,* Irine P. Muhiuddin, and Michael C. W. Evans Department of Biology, Darwin Building, UniVersity College London, Gower Street, London WC1E 6BT, U.K. ReceiVed June 25, 2001; ReVised Manuscript ReceiVed January 22, 2002

ABSTRACT: We report the detection of a “split” electron paramagnetic resonance (EPR) signal during illumination of dark-adapted (S1 state) oxygen-evolving photosystem II (PSII) membranes at