Proton-coupled electron flow in protein redox machines.
Proton-coupled electron flow in protein redox machines.
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DOI:
10.1021/cr100182b
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发表时间:
2010-12-08
期刊:
影响因子:
62.1
通讯作者:
Gray, Harry B.
中科院分区:
文献类型:
--
作者:
Dempsey, Jillian L.;Winkler, Jay R.;Gray, Harry B.
Electron transfer (ET) reactions are fundamental steps in biological redox processes. Respiration is a case in point: at least 15 ET reactions are required to take reducing equivalents from NADH, deposit them in O2, and generate the electrochemical proton gradient that drives ATP synthesis. 1-10 Most of these reactions involve quantum tunneling between weakly coupled redox cofactors (ET distances> 10 Å) embedded in the interiors of folded proteins. Here we review experimental findings that have shed light on the factors controlling these distant ET events. We also review work on a sensitizer-modified copper protein photosystem in which multistep electron tunneling (hopping) through an intervening tryptophan is orders of magnitude faster than the corresponding single-step ET reaction.If proton transfers are coupled to ET events, we refer to the processes as proton coupled ET, or PCET, a term introduced by Huynh and Meyer in 1981. 11 Here we focus on two protein redox machines, photosystem II and ribonucleotide reductase, where PCET processes involving tyrosines are believed to be critical for function. Relevant tyrosine model systems also will be discussed.
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影响因子:
56.9
作者:
BERATAN, DN;ONUCHIC, JN;GRAY, HB
通讯作者:
GRAY, HB
影响因子:
4
作者:
Benisvy, L;Blake, AJ;Wilson, C
通讯作者:
Wilson, C
DOI:
10.3891/acta.chem.scand.51-0533
发表时间:
1997-05-01
期刊:
ACTA CHEMICA SCANDINAVICA
影响因子:
--
作者:
Babcock, GT;Espe, M;Warncke, K
通讯作者:
Warncke, K
影响因子:
3.7
作者:
BERATAN, DN;ONUCHIC, JN
通讯作者:
ONUCHIC, JN
影响因子:
15
作者:
Biczók, L;Gupta, N;Linschitz, H
通讯作者:
Linschitz, H