Fold: S15/NS1 RNA-binding domain

3 helices; irregular array

Lineage:

1. Root: scop
2. Class: All alpha proteins
3. Fold: S15/NS1 RNA-binding domain
   3 helices; irregular array

Superfamilies:

1. S15/NS1 RNA-binding domain (3)
   1. N-terminal, RNA-binding domain of nonstructural protein NS1 (1)
   2. Ribosomal protein S15 (2)
      contains additional N-terminal helix that forms a separate unit
   3. a tRNA synthase domain (1)