The nature of the axial ligands of a heme group is an important factor in maintaining the
oxidation-reduction potential of a c-type cytochrome. Cytochrome c3 from Desulfovibrio …

Cytochrome c3 (M (r) 13,000) is a tetrahemic cytochrome in which the four heme iron atoms
are coordinated by 2 histidine residues at the axial positions. The presence of several …

Mireille Bruschi,*'* 1***** Patrick Bertrand, 8 Claude More, 8 Giséle Leroy, 1 Jacques
Bonicel, 11 Jean Haladjian,-1-Genevieve Chottard, 0 W. Brent R. Pollock, 7 and Gerrit …

A combination of structural, kinetic, and interaction experiments has been used to study the
role of a highly conserved aromatic residue, Tyr73, parallel to the sixth heme axial ligand of …

Reduction of the haems in tetrahaem cytochromes c 3 is a cooperative process, ie, reduction
of each of the haems depends on the redox states of the other haems. Furthermore, electron …

Unique among sulphate-reducing bacteria, Desulfovibrio africanus has two periplasmic
tetraheme cytochromes c3, one with an acidic isoelectric point which exhibits an unusually …

Cytochromes c are among the best characterized proteins, which consequently make them
attractive candidates for study by mutagenesis. Site-specific mutagenesis studies have been …

We have confirmed the propensity of fragments of cytochrome c to form complexes that
reproduce the structure and, in part, the functionality, of the native protein by preparing four …

Tetraheme cytochrome c 3 (cyt c 3) exhibits extremely low reduction potentials and unique
properties. Since axial ligands should be the most important factors for this protein, every …

The reagent 1-ethyl-3-(3-[14C] trimethylaminopropyl) carbodiimide (ETC) was used to
identify specific carboxyl groups on the cytochrome bc1 complex (ubiquinol-cytochrome c …