Four-helical up-and-down bundle (47161)
core: 4 helices; bundle, closed or partly opened, left-handed twist; up-and-down
Superfamily
Heme-containing proteins Superfamily
contains additional, fifth helix at the N-terminus Superfamily
contains extra helices in the loops at one end of the bundle Superfamily
can form closed, open and helix-swapped bundles Superfamily
contains extra alpha+beta subdomain formed by the N- and C-termini. Superfamily
flattened bundle at one end with helices 2 and coming in contact and separating helices 1 and 3 Superfamily
open bundle; there is a long groove between helices 1 and 4 Superfamily