Discoidin Domain

**Definition:** A protein domain originally identified in DISCOIDINS. It occurs in a variety of unrelated proteins in multicellular organisms, where it recognizes different ligands with distinct biological functions. Structurally, it consists of two antiparallel beta sheets that form a jellyroll configuration stabilized by two intramolecular disulfide bonds. Sequence differences within this module determine ligand specificity; in DISCOIDIN DOMAIN RECEPTORS, it binds to FIBRILLAR COLLAGENS and NON-FIBRILLAR COLLAGENS.

**Tree numbers:** - G02.111.570.820.709.275.750.219

**Synonyms:** - Discoidin Domains