Lineage for Family f.21.1.1: Formate dehydrogenase N, cytochrome (gamma) subunit

1. Root: SCOP 1.63

2. Class f: Membrane and cell surface proteins and peptides [56835] (34 folds)

3. Fold f.21: Heme-binding four-helical bundle [81344] (2 superfamilies) core: four transmembrane helices, up-and-down bundle, binds one or two heme groups in between the helices

4. Superfamily f.21.1: Transmembrane di-heme cytochromes [81342] (2 families) Three of the four heme-ligands are conserved between the two families; both heme groups bind similarly but not identically

5. Family f.21.1.1: Formate dehydrogenase N, cytochrome (gamma) subunit [75645] (1 protein)