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@ARTICLE{Hrabakova:51336,
author = {Hrabakova, J. and Ataka, K. and Heberle, J. and
Hildebrandt, P. and Murgida, D.},
title = {{L}ong distance electron transfer in cytochrome c oxidase
immobilised on electrodes. {A} surface enhanced resonance
{R}aman spectroscopic study},
journal = {Physical Chemistry Chemical Physics},
volume = {8},
issn = {1463-9076},
address = {Cambridge},
publisher = {RSC Publ.},
reportid = {PreJuSER-51336},
pages = {759 - 766},
year = {2006},
note = {Record converted from VDB: 12.11.2012},
abstract = {Cytochrome c oxidase was tethered to a functionalised Ag
electrode via a histidine-tag on the C-terminus of subunit I
or II and embedded in a phospholipid bilayer. The uniformly
oriented membrane-bound proteins were studied by surface
enhanced resonance Raman spectroscopy (SERRS) that reveals
preservation of the native structures of the heme a and heme
a(3) sites. On the basis of time-dependent SERRS
measurements, the rate constant for the heterogeneous
electron transfer to heme a was determined to be 0.002 s(-1)
independent of the enzyme orientation and the overpotential.
Taking into account that the electrode-to-heme a distance is
larger than 50 A, these findings suggest an electron hopping
mechanism in which the Cu(A) center is not involved.
Electrochemical reduction is restricted to heme a whereas
electron transfer from heme a to heme a(3), which in
solution occurs on the nanosecond time scale, is drastically
slowed down. It may be that the network of cooperativities
that links intramolecular electron transfer and proton
translocation is perturbed in the immobilised enzyme,
possibly due to the effect of the interfacial electric
field.},
keywords = {Chemistry, Physical / Electrodes / Electron Transport
Complex IV: chemistry / Enzymes, Immobilized: chemistry /
Models, Chemical / Oxidation-Reduction / Physicochemical
Phenomena / Silver: chemistry / Spectrum Analysis, Raman:
methods / Surface Properties / Time Factors / Enzymes,
Immobilized (NLM Chemicals) / Silver (NLM Chemicals) /
Electron Transport Complex IV (NLM Chemicals) / J (WoSType)},
cin = {IBI-2},
ddc = {540},
cid = {I:(DE-Juel1)VDB58},
pnm = {Funktion und Dysfunktion des Nervensystems},
pid = {G:(DE-Juel1)FUEK409},
shelfmark = {Chemistry, Physical / Physics, Atomic, Molecular $\&$
Chemical},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:16482317},
UT = {WOS:000235608500011},
doi = {10.1039/b513379n},
url = {https://juser.fz-juelich.de/record/51336},
}