Redox proteins multi-centre

Chi, Q.J., Zhang, J.D., Jensen, P.S., Nazmudtinov, R.R., and Ulstrup, J. (2008) Surface-induced intramolecular electron transfer in multi-centre redox metalloproteins the di-haem protein cytochrome q in homogeneous solution and at electrochemical surfaces. Journal of Physics Condensed Matter, 20, 374124. 

In an earlier discussion (Sect. 3.4) it was mentioned that the electrode reactions of proteins could be governed by radial-type diffusion, even at a macroscopically planar electrode surface, because of specificity for electroactive sites having microscopic dimensions. Deviation from linear diffusion behaviour depends upon the size and density of these sites [125,126]. Thus while the differences in waveshape between native and Ru couples that was noted in these studies may have a purely chemical-kinetic origin, the interesting possibility also arises that there exists different effective mass transport behaviour for the electrode reactions of each redox centre contained in a multi-centred macromolecule. Further evidence for this suggestion is presented in Sect. 5.2. 

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