pfam09626: DHC (This model is not part of the current CDD release)
Dihaem cytochrome c
Dihaem cytochrome c (DHC) is a soluble c-type cytochrome that folds into two distinct domains, each binding a single haem group and connected by a small linker region. Despite little sequence similarity, the N-terminal domain (residues 12-75) is a class I type cytochrome c, that binds one of the haems, but the domain surrounding the other haem is structurally unique. DHC binds electrostatically to an oxygen-binding protein, sphaeroides haem protein (SHP), as a component of a conserved electron transfer pathway. DHC acts as the physiological electron donor for SHP during phototrophic growth. In certain species DHC is found upstream of pfam01292.
Jiyao W et al.(2023). "The conserved domain database in 2023.",