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. Author manuscript; available in PMC: 2017 May 1.
Published in final edited form as: Biochim Biophys Acta. 2015 Sep 28;1857(5):513–521. doi: 10.1016/j.bbabio.2015.09.008

Table 1.

Key engineering parameters for several well-characterized inter-protein c-type cytochrome electron-transfer complexes [10,12–15]. Minimum distance between cofactor edges are estimated from published structures [13,15]. Log of electron-tunneling rates estimated from empirical expression [5], assuming protein reorganization energy of 1 eV [34].

Redox Pair D
(eV)		 Min. Cofactor
Distance (Å)		 Kd (µM) log kET
(s−1)
cyt c → CcO −0.07
(spheroides)		 11
(thermophilus)		 0.35 5.9
cyt c → CcP ~ −1.0 14 20 6.8
cyt bc1 → cyt c ~ 0 9 9.5 6.7
cyt c2 → P870 −0.16 8 1 8.2
Isocyt c2 → P870 −0.22 8 40 8.5