SCOPe 2.05: Family f.21.1.2: Cytochrome b of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)

Lineage for Family f.21.1.2: Cytochrome b of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)

1. Root: SCOPe 2.05

2. Class f: Membrane and cell surface proteins and peptides [56835] (57 folds)

3. 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

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.21.1.2: 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

Proteins:

1. Cytochrome b6 subunit of the cytochrome b6f complex [103498] (2 species)

   1. Species Green alga (Chlamydomonas reinhardtii) [TaxId:3055] [103500] (1 PDB entry)

   2. Species Mastigocladus laminosus [TaxId:83541] [103499] (4 PDB entries)

2. Mitochondrial cytochrome b subunit, N-terminal domain [81641] (3 species)
   also includes extra transmembrane (linker) helix absent in plants and cyanobacteria subunits

   1. Species Baker's yeast (Saccharomyces cerevisiae) [TaxId:4932] [81640] (5 PDB entries)

   2. Species Chicken (Gallus gallus) [TaxId:9031] [81639] (8 PDB entries)

   3. Species Cow (Bos taurus) [TaxId:9913] [81638] (17 PDB entries)
      Uniprot P00157

3. automated matches [196844] (6 species)
   not a true protein

   1. Species Baker's yeast (Saccharomyces cerevisiae) [TaxId:559292] [257467] (1 PDB entry)

   2. Species Chicken (Gallus gallus) [TaxId:9031] [255856] (4 PDB entries)

   3. Species Cow (Bos taurus) [TaxId:9913] [254895] (1 PDB entry)

   4. Species Mastigocladus laminosus [TaxId:83541] [196845] (4 PDB entries)

   5. Species Nostoc sp. [TaxId:103690] [255731] (2 PDB entries)

   6. Species Saccharomyces cerevisiae [TaxId:764097] [255785] (2 PDB entries)

More info for Family f.21.1.2: Cytochrome b of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)

Timeline for Family f.21.1.2: Cytochrome b of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase):

• Family f.21.1.2: Cytochrome b of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) first appeared in SCOP 1.63
  
• Family f.21.1.2: Cytochrome b of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) appears in SCOPe 2.04
  
• Family f.21.1.2: Cytochrome b of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) appears in SCOPe 2.06
  
• Family f.21.1.2: Cytochrome b of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) appears in the current release, SCOPe 2.08