Class f: Membrane and cell surface proteins and peptides [56835] (57 folds) |
Fold f.21: Heme-binding four-helical bundle [81344] (3 superfamilies) core: four transmembrane helices, up-and-down bundle, binds one or two heme groups in between the helices |
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 |
Family f.21.1.2: Cytochrome b of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81642] (3 proteins) a part (domain) of a larger mitochondrial cytochrome b subunit, separate subunit in plants and cyanobacteria |
Cytochrome b6 subunit of the cytochrome b6f complex [103498] (2 species) |
Species Green alga (Chlamydomonas reinhardtii) [TaxId:3055] [103500] (1 PDB entry) |
Species Mastigocladus laminosus [TaxId:83541] [103499] (5 PDB entries) |
Mitochondrial cytochrome b subunit, N-terminal domain [81641] (3 species) also includes extra transmembrane (linker) helix absent in plants and cyanobacteria subunits |
Species Baker's yeast (Saccharomyces cerevisiae) [TaxId:4932] [81640] (7 PDB entries) |
Species Chicken (Gallus gallus) [TaxId:9031] [81639] (4 PDB entries) |
Species Cow (Bos taurus) [TaxId:9913] [81638] (17 PDB entries) Uniprot P00157 |
automated matches [196844] (1 species) not a true protein |
Species Mastigocladus laminosus [TaxId:83541] [196845] (1 PDB entry) |
Timeline for Family f.21.1.2: Cytochrome b of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase):