Domain

Structures: LUD domain (IPR003741)

PDBe

The Protein Data Bank (PDB) is a repository for the 3-D structural data of large biological molecules, such as proteins and nucleic acids.

2g40 

CATH

CATH is a hierarchical classification of protein model structures.

3.40.50.10420 

SCOP

The Structural Classification of Proteins (SCOP) database is a largely manual classification of protein structural domains based on similarities of their amino acid sequences and three-dimensional structures.

c.124.1.7