A hydrogen-atom abstraction model for the function of Y-Z in photosynthetic oxygen evolution
(1995) In Photosynthesis Research 46(1-2). p.177-184- Abstract
- 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.... (More)
- 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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/127060
- author
- Hoganson, C W ; Tang, X S ; Tommos, C ; Warncke, K ; Babcock, G T ; Diner, B A ; McCracken, J ; Styring, Stenbjörn LU and Lydakis Simantiris, C W
- organization
- publishing date
- 1995
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- electron paramagnetic resonance, manganese cluster, oxygen evolution, oxygen evolving complex, Photosystem II, proton transfer, tyrosine radical, water oxidation
- in
- Photosynthesis Research
- volume
- 46
- issue
- 1-2
- pages
- 177 - 184
- publisher
- Springer
- external identifiers
-
- scopus:0000332870
- pmid:24301580
- ISSN
- 0166-8595
- DOI
- 10.1007/BF00020428
- language
- English
- LU publication?
- yes
- id
- 23f38ea0-3096-4d0a-b1e3-54d713bfcc4f (old id 127060)
- date added to LUP
- 2016-04-01 16:19:31
- date last changed
- 2021-01-03 05:35:47
@article{23f38ea0-3096-4d0a-b1e3-54d713bfcc4f,
abstract = {{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.}},
author = {{Hoganson, C W and Tang, X S and Tommos, C and Warncke, K and Babcock, G T and Diner, B A and McCracken, J and Styring, Stenbjörn and Lydakis Simantiris, C W}},
issn = {{0166-8595}},
keywords = {{electron paramagnetic resonance; manganese cluster; oxygen evolution; oxygen evolving complex; Photosystem II; proton transfer; tyrosine radical; water oxidation}},
language = {{eng}},
number = {{1-2}},
pages = {{177--184}},
publisher = {{Springer}},
series = {{Photosynthesis Research}},
title = {{A hydrogen-atom abstraction model for the function of Y-Z in photosynthetic oxygen evolution}},
url = {{http://dx.doi.org/10.1007/BF00020428}},
doi = {{10.1007/BF00020428}},
volume = {{46}},
year = {{1995}},
}