1H NMR studies of eukaryotic cytochrome c. Resonance assignments and iron-hexacyanide-mediated electron exchange.

1H NMR resonance assignments in the spectra of horse, tuna, Neurospora crassa and Candida krusei cytochromes c are described. Assignments have been made using NMR double-resonance techniques in conjunction with electron-exchange experiments, spectral comparison of related proteins, and consideration of the X-ray structure of tuna cytochrome c. Resonances arising from 11 residues of horse cytochrome c have been assigned.