Fold: RPB5-like RNA polymerase subunit

core: beta-alpha-beta-alpha-beta(2); 2 layers, alpha/beta

Lineage:

1. Root: scop
2. Class: Alpha and beta proteins (a+b)
   Mainly antiparallel beta sheets (segregated alpha and beta regions)
3. Fold: RPB5-like RNA polymerase subunit
   core: beta-alpha-beta-alpha-beta(2); 2 layers, alpha/beta

Superfamilies:

1. RPB5-like RNA polymerase subunit (2)
   1. RPB5 (3)
   2. HRPABC14.4, essential subunit of RNA polymerases I, II and III (RPB6) (1)