Do the higher oxidation states of the photosynthetic O2-evolving system contain bound H2O? - PubMed (original) (raw)

. 1986 Jan;195(1-2):285-9.

doi: 10.1016/0014-5793(86)80178-8.

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• PMID: 11538658
• DOI: 10.1016/0014-5793(86)80178-8

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Do the higher oxidation states of the photosynthetic O2-evolving system contain bound H2O?

R Radmer et al. FEBS Lett. 1986 Jan.

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Abstract

A modified mass spectrometer was used to determine whether the higher oxidation states of the photosynthetic O2-evolving system contain substrate water that is not freely exchangeable with the external medium. Our data indicated that the higher oxidation states contain no appreciable bound, non-exchangeable H2O. This suggests that H2O oxidation takes place via a rapid, concerted, all-or-none mechanism rather than by a mechanism involving stable, partially oxidized, H2O-derived intermediates. These findings set definite constraints on possible mechanisms of O2 evolution.

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