Lineage for Fold f.4: Transmembrane beta-barrels
- Root: SCOPe 2.08
Class f: Membrane and cell surface proteins and peptides [56835] (69 folds) 
Fold f.4: Transmembrane beta-barrels [56924] (7 superfamilies)
not a true fold, gathers together transmembrane barrels of different (n,S)
annotated by the SCOP(e) curators as 'not a true fold'
Superfamilies:
f.4.1: OMPA-like [56925] (5 families) 
forms (8,10) barrel
f.4.2: Outer membrane phospholipase A (OMPLA) [56931] (1 family)
forms (12,16) barrel
f.4.3: Porins [56935] (5 families) 
f.4.4: OMPT-like [69917] (3 families)
forms (10,12) barrel
f.4.5: Autotransporter [103515] (1 family)
forms (12,14) barrel; contains a long alpha-helix running along the barrel axis
automatically mapped to Pfam PF03797
f.4.6: Tsx-like channel [111364] (1 family)
forms (12,16) barrel
automatically mapped to Pfam PF03502
f.4.7: Outer membrane carboxylate (Occ) channels [310584] (3 families)
Pfam PF03573; Phylogeny discussed in PubMed 22272184
labile trimers according to PubMed 17952093; each subunit forms (18,22) barrel
More info for Fold f.4: Transmembrane beta-barrels
Timeline for Fold f.4: Transmembrane beta-barrels:
- Fold f.4: Transmembrane beta-barrels first appeared (with stable ids) in SCOP 1.55
- Fold f.4: Transmembrane beta-barrels appears in SCOPe 2.07