Miki T, Umeda M, Harada Y.
J Biochem (Tokyo). 2007 Jan 18; [Epub ahead of print]
Inhibition of Reversed Electron Transfer and Proton Transport in the Beef Heart Cytochrome bc1 Complex by Chemical Modification.
PMID: 17234684

Kolling DJ, Brunzelle JS, Lhee S, Crofts AR, Nair SK.
Atomic Resolution Structures of Rieske Iron-Sulfur Protein:
Role of Hydrogen Bonds in Tuning the Redox Potential of Iron-Sulfur Clusters.
Structure. 2007 Jan;15(1):29-38.
doi:10.1016/j.str.2006.11.012

Extinction Coefficients?

What are the most accurate extinction coefficients for determining the concentration of the bc1 complex or its individual chromophores? Are there significant differences between species?
Not important for many purposes, but it is if you are looking at stoichiometry in supercomplexes, studying the shape of inhibitor titration curves, counting the quinones, or quibbling over who has the highest turnover number!

Baymann F, Giusti F, Picot D, Nitschke W.
The ci/bH moiety in the b6f complex studied by EPR: A pair of strongly interacting hemes.
Proc Natl Acad Sci U S A. 2007 Jan 3; [Epub ahead of print]
PMID: 17202266