Lineage for Superfamily a.4.12: TrpR-like
- Root: SCOP 1.73
Class a: All alpha proteins [46456] (258 folds) 
Fold a.4: DNA/RNA-binding 3-helical bundle [46688] (14 superfamilies)
core: 3-helices; bundle, closed or partly opened, right-handed twist; up-and down
Superfamily a.4.12: TrpR-like [48295] (2 families) 
contains an extra shared helix after the HTH motif
Families:
a.4.12.1: Trp repressor, TrpR [48296] (1 protein)
intertwined dimer of identical 6-helical subunits
a.4.12.2: Chromosomal replication initiation factor DnaA C-terminal domain IV [81695] (1 protein)
monomeric; contains additional N-terminal helices
More info for Superfamily a.4.12: TrpR-like
Timeline for Superfamily a.4.12: TrpR-like:
- Superfamily a.4.12: TrpR-like first appeared (with stable ids) in SCOP 1.55, called Superfamily a.107.1: Trp repressor
- Superfamily a.4.12: TrpR-like appears in SCOP 1.71
- Superfamily a.4.12: TrpR-like appears in SCOP 1.75
- Superfamily a.4.12: TrpR-like appears in the current release, SCOPe 2.08