Electron tunneling in ruthenium-modified cytochromec

Deborah S. Wuttke, Morten J. Bjerrum, I. Jy Chang, Jay R. Winkler, Harry B. Gray

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

Distant Fe2+-Ru3+ electronic couplings have been extracted from intramolecular electron-transfer rates in Ru(2,2′-bipyridine)2(imidazole)(histidine-X)2+ (X = 33,39,62,72,79) derivatives of cytochromec. The rates are 〉 1 · 108 (79); 3.2(4) · 106 (39); 2.6(3) · 106 (33); 9.0(3) · 105 (72); 1.0(2) · 104 s−1 (62); the couplings increase according to 62 (0.006) < 72 (0.057) < 33 (0.097) < 39 (0.11) < 79 (〉 0.6 cm−1). The rates (and the couplings) correlate with the lengths of σ-tunneling pathways comprised of covalent bonds, hydrogen bonds, and through-space jumps from the histidines to the heme group.

Original languageEnglish
Pages (from-to)168-170
Number of pages3
JournalBiochimica et Biophysica Acta - Bioenergetics
Volume1101
Issue number2
DOIs
Publication statusPublished - 1992 Jan 1

Keywords

  • Electron transfer
  • Electronic coupling
  • Intramolecular rate
  • Pathway

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Cell Biology

Fingerprint Dive into the research topics of 'Electron tunneling in ruthenium-modified cytochromec'. Together they form a unique fingerprint.

  • Cite this