Long‐Range Electron Transfer in Myoblobina
- 17 December 1988
- journal article
- Published by Wiley in Annals of the New York Academy of Sciences
- Vol. 550 (1) , 68-84
- https://doi.org/10.1111/j.1749-6632.1988.tb35324.x
Abstract
The distance and driving-force dependences of electron transfer (ET) in a set of four surface-ruthenated myoglobins, in which the heme prosthetic group has been systematically replaced by a series of metalloporphyrins of differing excited-state redox potentials, have provided information on the magnitude [Hab(12.7 A) approximately 6.3 x 10(-3) cm-1] and decay [beta approximately 0.8 A-1, where kET alpha exp [-beta(d - do)]] of protein-mediated donor-acceptor electronic coupling. A reorganization energy lambda approximately 1.3 eV, due to coordination and solvation changes both at and between the ET sites, has been estimated using a rate expression that allows electron-vibration coupling to classical and quantum mechanical modes. The contribution to lambda from the porphyrin and peptide matrix is approximately 0.7 eV. Specific electron-tunneling pathways in the protein have been evaluated.Keywords
This publication has 25 references indexed in Scilit:
- Free energy dependence of the rate of long-range electron transfer in proteins. Reorganization energy in ruthenium-modified myoglobinJournal of the American Chemical Society, 1988
- Rate-Constant Expressions for Nonadiabatic Electron-Transfer ReactionsComments on Inorganic Chemistry, 1987
- Kinetic studies on the reaction center protein from Rhodopseudomonas sphaeroides: the temperature and free energy dependence of electron transfer between various quinones in the QA site and the oxidized bacteriochlorophyll dimerThe Journal of Physical Chemistry, 1986
- Mössbauer and susceptibility study of inter-heme spin coupling in [Fe (OEP) (2-MeHIm)]+ dimersThe Journal of Chemical Physics, 1985
- Kinetics and mechanisms of electron transfer between blue copper proteins and electronically excited chromium and ruthenium polypyridine complexesInorganic Chemistry, 1985
- Electron transfers in chemistry and biologyBiochimica et Biophysica Acta (BBA) - Reviews on Bioenergetics, 1985
- Tilden Lecture. Structure and electron-transfer reactivity of the blue copper protein plastocyaninChemical Society Reviews, 1985
- The Mitochondrial Electron Transport and Oxidative Phosphorylation SystemAnnual Review of Biochemistry, 1985
- Ground- and excited-state electron-transfer reactions: photoinduced redox reactions of poly(pyridine)ruthenium(II) complexes and cobalt(III) cage compoundsInorganic Chemistry, 1984
- Electron-transfer kinetics of pentaammineruthenium(III)(histidine-33)-ferricytochrome c. Measurement of the rate of intramolecular electron transfer between redox centers separated by 15.ANG. in a proteinJournal of the American Chemical Society, 1982