GM1b/asialo-GM1 oligosaccharide-binding R-type lectin

UniProtKB accession:  A0A646QV53

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Galbeta1-3GalNAcbeta1-4Galbeta1-4Glc oligosaccharide-binding lectin. Binds strongly to the oligosaccharides of ganglioside GM1b and to a lesser extent its precursor asialo-GM1 (PubMed:31769916, PubMed:33328520). Binds weakly to asialo-GM2 oligosaccharide and to the glycan moiety of globo-series stage-specific embryonal antigen 4 (SSEA-4) hexaose (PubMed:31769916). Binds galactose, N-acetylgalactose and lactose. Does not bind GM1 (PubMed:33328520). Does not bind to Gal-beta1,3-GalNAc (Thomsen-Friedenreich antigen), the oligosaccharide of GM1a ganglioside or SSEA-4 tetraose. Does not bind to N-glycans, O-glycans or glycosaminoglycans of glycoproteins. Does not bind Lewis glycans, derivatives of lactose or N-acetyllactosamine or blood group (ABH-type) oligosaccharides (PubMed:31769916). Does not bind glucose (PubMed:33328520). Has hemagglutination activity towards rabbit erythrocytes (PubMed:31769916, PubMed:33328520). Displays cytotoxic effects against various cultured cell lines including human breast (MCF-7), cervical (HeLa) and colon cancer (Caco2) cell lines, as well as dog kidney (MDCK) cell line that express asialo-GM1 oligosaccharide at their cell surface. Shows dose- and time-dependent activation of MKK3/6, ERK1/2 and p38 MAPK, as well as caspase-3/9 in HeLa cervical cancer cells. No cytotoxic effect on BT474 human breast cancer cell line. May be involved in recognition of glycans found on parasitic or symbiotic microorganisms (PubMed:31769916).