Heme c in cytochrome c

Heme c, with two cysteine ligands

Half-cell reaction:
ferrocytochrome c ==> ferricytochrome c⁺ + e^-

Midpoint redox potential: E_{m, pH 7} = -100 to 350 mV, depending on protein
No. of electrons: z=1
No. of protons: n=0 or 1, depending on protein, pH, pK
©Copyright 1996, Antony Crofts, University of Illinois at Urbana-Champaign, a-crofts@uiuc.edu