Lineage for Superfamily a.4.13: Sigma3 and sigma4 domains of RNA polymerase sigma factors
- Root: SCOP 1.69
Class a: All alpha proteins [46456] (218 folds) 
Fold a.4: DNA/RNA-binding 3-helical bundle [46688] (13 superfamilies)
core: 3-helices; bundle, closed or partly opened, right-handed twist; up-and down
Superfamily a.4.13: Sigma3 and sigma4 domains of RNA polymerase sigma factors [88659] (3 families) 
Families:
a.4.13.1: Sigma3 domain [88660] (3 proteins) a.4.13.2: Sigma4 domain [88665] (5 proteins) 
a.4.13.3: YlxM/p13-like (Pfam 04297; UPF0122) [109706] (1 protein)
structural and detectable sequence similarity to Sigma4 domain; contains extra C-terminal all-alpha oligomerization subdomain; forms different, helix-swapped dimers
More info for Superfamily a.4.13: Sigma3 and sigma4 domains of RNA polymerase sigma factors
Timeline for Superfamily a.4.13: Sigma3 and sigma4 domains of RNA polymerase sigma factors:
- Superfamily a.4.13: Sigma3 and sigma4 domains of RNA polymerase sigma factors first appeared in SCOP 1.65
- Superfamily a.4.13: Sigma3 and sigma4 domains of RNA polymerase sigma factors appears in SCOP 1.67
- Superfamily a.4.13: Sigma3 and sigma4 domains of RNA polymerase sigma factors appears in SCOP 1.71
- Superfamily a.4.13: Sigma3 and sigma4 domains of RNA polymerase sigma factors appears in the current release, SCOPe 2.08