... protein–protein interactions [6], as well as in the structural stability of proteins [23–25] Inspection of a preliminary structural model of cyt c6, based on the known structure of cytochrome c6 from ... oxygen of D72 Taking the functionally and structurally interesting mutant D72K as a material starting point, we aimed to study the contribution of the electrostatic charges at positions D72 and K8 ... traces at the three pH conditions for (A) wild-type ( ), K8A (s), D72A ⁄ K8D (n), D72K ⁄ K8D (,) and D72A ⁄ K8A (e), and for (B) K8D ( ), D72K (s), D72N (n), D72A (,) and D72K ⁄ K8A (e) The lines...