Interaction of cytochrome c with cytochrome oxidase: two different docking scenarios.
Maneg O, Malatesta F, Ludwig B, Drosou V, Biochim Biophys Acta, 2004 Apr 12 - link

Mutations in the docking site for cytochrome c on the Paracoccus heme aa3 oxidase. Electron entry and kinetic phases of the reaction.
Drosou V, Malatesta F, Ludwig B, Eur J Biochem, 2002 Jun - link

Tryptophan 121 of subunit II is the electron entry site to cytochrome-c oxidase in Paracoccus denitrificans. Involvement of a hydrophobic patch in the docking reaction.
Witt H, Malatesta F, Nicoletti F, Brunori M, Ludwig B, J Biol Chem, 1998 Feb 27 - link