Mutation of arginine 357 of the CP43 protein of photosystem II severely impairs the catalytic S-state cycle of the H2O oxidation complex.

Abstract excerpt

Basic amino acid side chains situated in active sites may mediate critical proton transfers during an enzymatic catalytic cycle. In the case of photosynthetic water oxidation, a strong base is postulated to facilitate the deprotonation of the active site Mn4-Ca cluster, thereby allowing the otherwise thermodynamically constrained transfer of an electron away from the Mn4-Ca cluster to the oxidized redox active...

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