D-galactoside/L-rhamnose binding SUEL lectin domain superfamily

Definition

The D-galactoside binding lectin purified from sea urchin (Anthocidaris crassispina) eggs exists as a disulphide-linked homodimer of two subunits; the dimeric form is essential for hemagglutination activity PMID:2001368. 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 latter shown that it binds to L-rhamnose preferentially [[cite:PMID:2001368], [cite:PMID:10564781]]. L-rhamnose and D-galactose share the same hydroxyl group orientation at C2 and C4 of the pyranose ring structure. A cysteine-rich domain homologous to the SUEL protein has been identified in the following proteins [[cite:PMID:9261169], [cite:PMID:9668106], [cite:PMID:9920906]]: Plant beta-galactosidases ([ec:3.2.1.23]) (lactases). Mammalian latrophilin, the calcium independent receptor of alpha-latrotoxin (CIRL). The galactose-binding lectin domain is not required for alpha-latratoxin binding PMID:9920906. Human lectomedin-1. Rhamnose-binding lectin (SAL) from catfish (Silurus asotus, Namazu) eggs. This protein is composed of three tandem repeat domains homologous to the SUEL lectin domain. All cysteine positions of each domain are completely conserved PMID:10564781. The hypothetical B0457.1, F32A7.3A and F32A7.3B proteins from Caenorhabditis elegans. The human KIAA0821 protein. Structurally, the rhamnose-binding lectin domain (also known as the N-terminal lectin domain, Lec) is composed of five β-strands , a single, long α-helix, and two small helical elements. The overall fold is that of a β-sandwich with two antiparallel sheets PMID:18547526.

5 human proteins with this domain

Each is a reviewed human protein in the Seroatlas serome and a potential autoantibody target; this domain groups them into one antibody-relevant category. Every entry links to its own record.

Download CSV (5 proteins: gene, accession, name)

• ADGRL1
• ADGRL2
• ADGRL3
• EVA1C
• PKD1L2