Substrate–water exchange in photosystem II is arrested before dioxygen formation View Full Text


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Article Info

DATE

2014-07-04

AUTHORS

Håkan Nilsson, Fabrice Rappaport, Alain Boussac, Johannes Messinger

ABSTRACT

Light-driven oxidation of water into dioxygen, catalysed by the oxygen-evolving complex (OEC) in photosystem II, is essential for life on Earth and provides the blueprint for devices for producing fuel from sunlight. Although the structure of the OEC is known at atomic level for its dark-stable state, the mechanism by which water is oxidized remains unsettled. Important mechanistic information was gained in the past two decades by mass spectrometric studies of the H2(18)O/H2(16)O substrate-water exchange in the four (semi) stable redox states of the OEC. However, until now such data were not attainable in the transient states formed immediately before the O-O bond formation. Using modified photosystem II complexes displaying up to 40-fold slower O2 production rates, we show here that in the transient S3YZ state the substrate-water exchange is dramatically slowed as compared with the earlier S states. This further constrains the possible sites for substrate-water binding in photosystem II. More... »

PAGES

4305

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/ncomms5305

DOI

http://dx.doi.org/10.1038/ncomms5305

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1025873632

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/24993602


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