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Literature DB >> 26790882

Proton-coupled electron hopping in Ru-modified P. aeruginosa azurin.

Jeffrey J Warren^1,2, Oliver S Shafaat³, Jay R Winkler³, Harry B Gray⁴.

Abstract

We constructed two artificial multiple-step electron transfer (hopping) systems based on Pseudomonas aeruginosa azurin where a tyrosine (YOH) is situated between Ru(2,2'-bipyridine)2(imidazole)(histidine) and the native copper site: RuH107YOH109 and RuH124-YOH122. We investigated the rates of Cu(I) oxidation by flash-quench generated Ru(III) over a range of conditions that probed the role of proton-coupled oxidation/reduction of YOH in the reaction. Rates of Cu(I) oxidation were enhanced over single-step electron transfer by factors between 3 and 80, depending on specific scaffold and buffer conditions.

Entities: Chemical Disease Species

Keywords: Copper oxidation; RuIII oxidants

Mesh：

Substances：
Protons
Azurin
Ruthenium

Year: 2016 PMID： 26790882 PMCID： PMC4775413 DOI： 10.1007/s00775-016-1332-4

Source DB: PubMed Journal: J Biol Inorg Chem ISSN： 0949-8257 Impact factor: 3.358

40 in total

1. Structures of ruthenium-modified Pseudomonas aeruginosa azurin and [Ru(2,2'-bipyridine)2(imidazole)2]SO4 x 10H2O.

Authors: S Faham; M W Day; W B Connick; B R Crane; A J Di Bilio; W P Schaefer; D C Rees; H B Gray
Journal: Acta Crystallogr D Biol Crystallogr Date: 1999-02

Review 2. Thermochemistry of proton-coupled electron transfer reagents and its implications.

Authors: Jeffrey J Warren; Tristan A Tronic; James M Mayer
Journal: Chem Rev Date: 2010-10-06 Impact factor: 60.622

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Review 4. Water-splitting chemistry of photosystem II.

Authors: James P McEvoy; Gary W Brudvig
Journal: Chem Rev Date: 2006-11 Impact factor: 60.622

5. The role of free energy change in coupled electron-proton transfer.

Authors: Christine J Fecenko; H Holden Thorp; Thomas J Meyer
Journal: J Am Chem Soc Date: 2007-11-14 Impact factor: 15.419

6. Intrinsic reactivity and driving force dependence in concerted proton-electron transfers to water illustrated by phenol oxidation.

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7. Electron hopping through proteins.

Authors: Jeffrey J Warren; Maraia E Ener; Antonín Vlček; Jay R Winkler; Harry B Gray
Journal: Coord Chem Rev Date: 2012-04-05 Impact factor: 22.315

8. Kinetics of electron transfer reactions of H2-evolving cobalt diglyoxime catalysts.

Authors: Jillian L Dempsey; Jay R Winkler; Harry B Gray
Journal: J Am Chem Soc Date: 2010-01-27 Impact factor: 15.419

9. Branched activation- and catalysis-specific pathways for electron relay to the manganese/iron cofactor in ribonucleotide reductase from Chlamydia trachomatis.

Authors: Wei Jiang; Lana Saleh; Eric W Barr; Jiajia Xie; Monique Maslak Gardner; Carsten Krebs; J Martin Bollinger
Journal: Biochemistry Date: 2008-07-26 Impact factor: 3.162