Symbol Gal_Lectin InterPro IPR000922 PDB RCSB PDB; PDBe; PDBj | Pfam PF02140 Pfam structures PDBsum structure summary | |
In molecular biology, the galactose binding lectin domain is a protein domain. It is found in many proteins including the lectin purified from sea urchin (Anthocidaris crassispina) eggs, SUEL. This lectin exists as a disulfide-linked homodimer of two subunits; the dimeric form is essential for hemagglutination activity. The sea urchin egg lectin (SUEL) forms a new class of lectins. Although SUEL was first isolated as a D-galactoside binding lectin, it was later shown that it binds to L-rhamnose preferentially. L-rhamnose and D-galactose share the same hydroxyl group orientation at C2 and C4 of the pyranose ring structure.
A cysteine-rich domain (the galactose binding lectin domain) homologous to the SUEL protein has been identified in the following proteins: