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. Author manuscript; available in PMC: 2009 Feb 1.
Published in final edited form as: Coord Chem Rev. 2008 Feb;252(3-4):395–415. doi: 10.1016/j.ccr.2007.09.006

Figure 3.

Figure 3

Catalytic cycle proposed by Joliot and Kok for water splitting into dioxygen, protons and electrons at the OEC in PSII [1,2]. Dashed arrows indicate spontaneous interconversion processes in the dark. The steps for substrate water attachment and proton release are only tentatively proposed and might change with pH.