Search for intermediates of photosynthetic water oxidation

DC FieldValueLanguage
dc.contributor.authorClausen, J
dc.contributor.authorJunge, W
dc.date.accessioned2021-12-23T15:58:27Z-
dc.date.available2021-12-23T15:58:27Z-
dc.date.issued2005
dc.identifier.issn01668595
dc.identifier.urihttps://osnascholar.ub.uni-osnabrueck.de/handle/unios/3383-
dc.descriptionInternational Satellite Meeting in honor of Norio Murata on Photosynthesis and the Post-Genomic Era, Trois Rivieres, CANADA, AUG 25-28, 2004
dc.description.abstractPhotosystem II of cyanobacteria and plants incorporates the catalytic centre of water oxidation. Powered and clocked by quanta of light the centre accumulates four oxidising equivalents before oxygen is released. The first three oxidising equivalents are stored on the Mn4Ca-cluster, raising its formal oxidation state from S-0 to S-3 and the third on Y-Z, producing S-3 Y-Z(ox). From there on water oxidation proceeds in what appears as a single reaction step (S3YZox(H2O)(2) reversible arrow O-2 4H(+) S-0. Intermediate oxidation products of bound water had not been detected, until our recent report on the stabilisation of such an intermediate by high oxygen pressure (NATURE 430, 2004, 480-483). Based on the oxygen titration (half-point 2.3 bar) the standard free-energy profile of a reaction sequence with a single intermediate was calculated. It revealed a rather small difference (-3 kJ mol(-1)) between the starting state [S3YZox(H2O)(2) and the product state S0YZ O-2 4H(+). Here we describe the tests for side effects of exposing core particles to high oxygen pressure. We found the reduction of P-680(+center dot) in ns and the reduction/dismutation of quinones at the acceptor side of PSII both unaffected, and the inhibition of the oxygen evolving reaction by exposure to high O-2-pressure was fully reversible by decompression to atmospheric conditions.
dc.language.isoen
dc.publisherSPRINGER
dc.relation.ispartofPHOTOSYNTHESIS RESEARCH
dc.subjectCOMPLEXES
dc.subjectDIFFERENCE SPECTRUM
dc.subjectELECTRON-TRANSFER
dc.subjectEVOLUTION
dc.subjectintermediate
dc.subjectPARTICLES
dc.subjectphotosynthesis
dc.subjectPhotosystem II
dc.subjectPHOTOSYSTEM-II
dc.subjectPlant Sciences
dc.subjectPROTON-TRANSFER
dc.subjectREDUCTION KINETICS
dc.subjectS-state
dc.subjectSYNECHOCOCCUS
dc.subjectTRANSITIONS
dc.subjectwater oxidation
dc.titleSearch for intermediates of photosynthetic water oxidation
dc.typeconference paper
dc.identifier.doi10.1007/s11120-005-3480-1
dc.identifier.isiISI:000230845200050
dc.description.volume84
dc.description.issue1-3
dc.description.startpage339
dc.description.endpage345
dc.identifier.eissn15735079
dc.publisher.placeVAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
dcterms.isPartOf.abbreviationPhotosynth. Res.
crisitem.author.deptFB 05 - Biologie/Chemie-
crisitem.author.deptidfb05-
crisitem.author.parentorgUniversität Osnabrück-
crisitem.author.netidJuWo587-
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