Fold: Viral protein domain

sandwich; 9 strands in 2 sheets; jelly-roll; form trimers

Lineage:

1. Root: scop
2. Class: All beta proteins
3. Fold: Viral protein domain
   sandwich; 9 strands in 2 sheets; jelly-roll; form trimers

Superfamilies:

1. Viral protein domain (3)
   forms homotrimers
   1. Top domain of virus capsid protein (3)
      this domain is inserted into a multihelical domain
   2. Influenza hemagglutinin headpice (1)
   3. Hemagglutinin domain of haemagglutinin-esterase-fusion glycoprotein HEF1 (1)