Fold: Membrane all-alpha

Lineage:

1. Root: scop
2. Class: Membrane and cell surface proteins and peptides
   Does not include proteins in the immune system
3. Fold: Membrane all-alpha

Superfamilies:

1. Membrane all-alpha (10)
   this is not a true superfamily family; in this provisional classification each transmembrane helix is considered to be a 'domain'
   1. Seven-helix membrane receptors (4)
   2. Photosynthetic reaction centre, L-, M- and H-chains (3)
   3. Cytochrome c oxidase-like (4)
      There are two common subunits shared by all members
   4. F1F0 ATP synthase subunits (2)
   5. Aquaporin-like (2)
   6. Potassium chanel protein (1)
   7. Gated mechanosensitive channel (1)
   8. Cytochrome bc1 transmembrane subunits (2)
   9. Fumarate reductase respiratory complex transmembrane subunits (2)
   10. Calcium ATPase (1)