Fold: Helix-loop-helix DNA-binding domain

4-helices; bundle, closed, left-handed twist; 2 crossover connections

Lineage:

1. Root: scop
2. Class: All alpha proteins
3. Fold: Helix-loop-helix DNA-binding domain
   4-helices; bundle, closed, left-handed twist; 2 crossover connections

Superfamilies:

1. Helix-loop-helix DNA-binding domain (1)
   dimer of two identical helix-loop-helix subunits
   1. Helix-loop-helix DNA-binding domain (6)
      1. Max protein
         also contains leucine-zipper motif
         1. Human (Homo sapiens) (1)
         2. Mouse (Mus musculus) (1)
      2. Myod B/HLH domain
         1. Mouse (Mus musculus) (1)
      3. Usf B/HLH domain
         1. Human (Homo sapiens) (1)
      4. Pho4 B/HLH domain
         1. Baker's yeast (Saccharomyces cerevisiae) (1)
      5. SREBP-1a
         1. Human (Homo sapiens) (1)