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A hydrogen-atom abs...
A hydrogen-atom abstraction model for the function of Y-Z in photosynthetic oxygen evolution
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Hoganson, C W (författare)
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Tang, X S (författare)
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Tommos, C (författare)
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Warncke, K (författare)
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Babcock, G T (författare)
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Diner, B A (författare)
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McCracken, J (författare)
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- Styring, Stenbjörn (författare)
- Lund University,Lunds universitet,Biokemi och Strukturbiologi,Centrum för Molekylär Proteinvetenskap,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Biochemistry and Structural Biology,Center for Molecular Protein Science,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH
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Lydakis Simantiris, C W (författare)
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(creator_code:org_t)
- 1995
- 1995
- Engelska.
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Ingår i: Photosynthesis Research. - 0166-8595. ; 46:1-2, s. 177-184
- Relaterad länk:
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http://dx.doi.org/10...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Recent magnetic-resonance work on Y-Z suggests that this species exhibits considerable motional flexibility in its functional site and that its phenol oxygen is not involved in a well-ordered hydrogen-bond interaction (Tang et al., submitted; Tommos et al., in press). Both of these observations are inconsistent with a simple electron-transfer function for this radical in photosynthetic water oxidation. By considering the roles of catalytically active amino acid radicals in other enzymes and recent data on the water-oxidation process in Photosystem II, we rationalize these observations by suggesting that Y-Z functions to abstract hydrogen atoms from aquo- and hydroxy-bound manganese ions in the (Mn)(4) cluster on each S-state transition. The hydrogen-atom abstraction process may occur either by sequential or concerted kinetic pathways. Within this model, the (Mn)(4)/Y-Z center forms a single catalytic center that comprises the Oxygen Evolving Complex in Photosystem II.
Ämnesord
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
Nyckelord
- electron paramagnetic resonance
- manganese cluster
- oxygen evolution
- oxygen evolving complex
- Photosystem II
- proton transfer
- tyrosine radical
- water oxidation
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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