Fold: beta-clip

double-stranded ribbon sharply bent in two places; the ribbon ends form incomplete barrel; jelly-roll

Lineage:

1. Root: scop
2. Class: All beta proteins
3. Fold: beta-clip
   double-stranded ribbon sharply bent in two places; the ribbon ends form incomplete barrel; jelly-roll

Superfamilies:

1. Type III antifreeze protein (1)
   duplication: consists of two structural repeats related by pseudodyad
2. SET domain (3)
   duplication: the core is composed of two structural repeats similar to (circularly permuted) repeats of AFPIII
   also contains a substrate-binding alpha+beta subdomain inserted in the core
3. Head decoration protein D (gpD, major capsid protein D) (1)
4. Urease, beta-subunit (1)
5. Molybdenum cofactor biosynthesis protein MoeA, C-terminal domain (1)
6. Deoxyuridine 5'-triphosphate nucleotidohydrolase (dUTPase) (1)
   forms tight trimer through an additional beta-sheet in each subunit
   subunit beta-sheets are orthogonally packed around the three-fold axis
7. ACMNPV telokin-like protein (1)
   similar to dUTPase in fold and trimeric assembly