Lineage for Fold b.82: Double-stranded beta-helix
- Root: SCOP 1.63
Class b: All beta proteins [48724] (119 folds) 
Fold b.82: Double-stranded beta-helix [51181] (7 superfamilies)
one turn of helix is made by two pairs of antiparallel strands linked with short turns
has appearance of a sandwich of distinct architecture and jelly-roll topology
Superfamilies:
b.82.1: RmlC-like cupins [51182] (6 families) 
b.82.2: Clavaminate synthase-like [51197] (6 families)
Iron and ketoglutarate-dependent enzymes; elaborated version of this common fold
b.82.3: cAMP-binding domain-like [51206] (2 families) 
b.82.4: Regulatory protein AraC [51215] (1 family) 
b.82.5: Trp RNA-binding attenuation protein (TRAP) [51219] (1 family)
shorter variant of double-helix
b.82.6: Thiamin pyrophosphokinase, substrate-binding domain [63862] (1 family) 
b.82.7: Calcium ATPase, transduction domain A [81653] (1 family)
a distorted variant of double-helix
More info for Fold b.82: Double-stranded beta-helix
Timeline for Fold b.82: Double-stranded beta-helix:
- Fold b.82: Double-stranded beta-helix first appeared (with stable ids) in SCOP 1.55
- Fold b.82: Double-stranded beta-helix appears in SCOP 1.61
- Fold b.82: Double-stranded beta-helix appears in SCOP 1.65
- Fold b.82: Double-stranded beta-helix appears in the current release, SCOPe 2.08