Photosynthetic water oxidation at high O-2 backpressure monitored by delayed chlorophyll fluorescence

DC FieldValueLanguage
dc.contributor.authorClausen, J
dc.contributor.authorJunge, W
dc.contributor.authorDau, H
dc.contributor.authorHaumann, M
dc.date.accessioned2021-12-23T16:08:53Z-
dc.date.available2021-12-23T16:08:53Z-
dc.date.issued2005
dc.identifier.issn00062960
dc.identifier.urihttps://osnascholar.ub.uni-osnabrueck.de/handle/unios/8498-
dc.description.abstractThe atmospheric dioxygen is produced by photosynthetic organisms. This light-driven process culminates in what appears as one step: a four-electron abstraction from two water molecules bound to the Mn4Ca complex of photosystem II. Recently, an intermediate of the O-2-producing reaction sequence was stabilized by elevated oxygen backpressure and detected by UV flash photometry [Clausen, J., and Junge, W. (2004) Nature 430, 480]. We scrutinized its properties by delayed chlorophyll fluorescence measurements. Half-suppression of oxygen evolution was observed at a similar O-2 pressure of 2.3 bar, as previously, now with photosystem II membrane particles from spinach, without artificial electron acceptors, and at a high signal-to-noise ratio. The data are tentatively interpreted as the stabilization of a 2-fold oxidized state of the catalytic center (S-2*) With bound peroxide and its slow conversion into the normal S-2 state by the release of peroxide.
dc.language.isoen
dc.publisherAMER CHEMICAL SOC
dc.relation.ispartofBIOCHEMISTRY
dc.subjectBiochemistry & Molecular Biology
dc.subjectCLUSTER
dc.subjectCOMPLEX
dc.subjectDEPENDENCE
dc.subjectII MEMBRANE-PARTICLES
dc.subjectOXYGEN EVOLUTION
dc.subjectPHOTOSYSTEM-II
dc.subjectSPECTROSCOPY
dc.subjectSPINACH
dc.subjectTEMPERATURE
dc.titlePhotosynthetic water oxidation at high O-2 backpressure monitored by delayed chlorophyll fluorescence
dc.typejournal article
dc.identifier.doi10.1021/bi051183a
dc.identifier.isiISI:000232125500016
dc.description.volume44
dc.description.issue38
dc.description.startpage12775
dc.description.endpage12779
dc.contributor.orcid0000-0001-6482-7494
dc.contributor.researcheridA-7087-2013
dc.publisher.place1155 16TH ST, NW, WASHINGTON, DC 20036 USA
dcterms.isPartOf.abbreviationBiochemistry
crisitem.author.deptFB 05 - Biologie/Chemie-
crisitem.author.deptidfb05-
crisitem.author.parentorgUniversität Osnabrück-
crisitem.author.netidJuWo587-
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