New Article- SQ at Qi - more evidence for His involvement

Sergei A. Dikanov, J. Todd Holland, Burkhard Endeward, Derrick R. J. Kolling, Rimma I. Samoilova, Thomas F. Prisner, and Antony R. Crofts
Hydrogen bonds between nitrogen donors and the semiquinone in the Qi-site of the bc1 complex
J. Biol. Chem, 10.1074/jbc.M702333200

New Article - More on the asymmetric dimer

Covian RG, Zwicker K, Rotsaert FA, Trumpower BL.
Asymmetric and redox-specific binding of quinone and quinol at center N of the dimeric yeast cytochrome bc1 complex: Consequences for semiquinone stabilization.
J Biol Chem. 2007 Jun 21; [Epub ahead of print]
PMID: 17584742