Four-helical up-and-down bundle Fold

Superfamily Families Domains
Apolipoprotein 1 1
Aspartate receptor, ligand-binding domain 2 2
Cytochromes 4 6
Hemerythrin-like 1 2
TMV-like viral coat proteins 1 3
FKBP12-rapamycin-binding domain of FKBP-rapamycin-associated protein (FRAP) 1 1
Proteasome activator 1 2
alpha-catenin/vinculin-like 2 3
Histidine-containing phosphotransfer domain, HPT domain 10 9
Bacterial GAP domain 1 3
Domain of the SRP/SRP receptor G-proteins 2 4
Outer surface protein C (OspC) 2 2
FAT domain of focal adhesion kinase 2 2
FAD-dependent thiol oxidase 4 3
RecG, N-terminal domain 1 1
Nucleotidyltransferase substrate binding subunit/domain 5 7
Group V grass pollen allergen 1 2
Oxygen-evolving enhancer protein 3, 1 1
Flagellar export chaperone FliS 2 2
Colicin D immunity protein 1 1
Nickel-containing superoxide dismutase, NiSOD 1 1
Mannose-6-phosphate receptor binding protein 1 (Tip47), C-terminal domain 1 1
Domain from hypothetical 2610208m17rik protein 1 1
TrmE connector domain 1 1
YppE-like 1 3
MW0975(SA0943)-like 1 1
VPS28 C-terminal domain-like 2 2
TM1646-like 2 2