Protein: Alpha-N-acetylneuraminate alpha-2,8-sialyltransferase ST8SIA3 (Q64689)
Organism: Mus musculus (Mouse)
Function: Catalyzes the transfer of sialic acid from a CMP-linked sialic acid donor onto a terminal alpha-2,3-, alpha-2,6-, or alpha-2,8- linked sialic acid of an acceptor, such as N-linked oligosaccharides of glycoproteins and glycolipids through alpha-2,8-linkages . Forms oligosialic and polysialic acid on various sialylated N-acetyllactosamine oligosaccharides of glycoproteins, including FETUB N-glycans, a2-HS-glycoprotein (AHSG) and alpha 2,3- sialylated glycosphingolipids, such as alpha 2,3-sialylparagloboside and ganglioside GM3 and to a lesser extent NCAM1 N-glycans . However, it is much more specific to N-linked oligosaccharides of glycoproteins than glycosphingolipids . 2,3-sialylparagloboside served as the best acceptor substrate among the glycolipids. alpha-Neu5Ac-(2->8)- alpha-Neu5Ac-(2->3)-beta-D-Gal-(1->4)-6S-D-GlcNAc and monosialyl and disialyl N-acetyllactosamines are the best acceptor substrates among glycoproteins (By similarity). May play critical role in the striatum by mediating the formation of disialylated and trisialylated terminal glycotopes on N- and O-glycans of specific striatal proteins, regulating their distribution in lipid rafts, affecting their interaction with other binding partners, and subsequently modulating striatal functions
Subcellular location: Golgi apparatus membrane ; Single-pass type II membrane protein
InterPro domains:
- IPR050943: Glycosyltransferase 29 (Sialyltransferase) (family) [79-379]
- IPR001675: Glycosyl transferase family 29 (family) [118-370]
- IPR038578: GT29-like superfamiliy (homologous_superfamily) [88-380]
- IPR012163: Sialyltransferase (family) [6-379]
Sequence:
MRNCKMARVASVLGLVMLSVALLILSLISYVSLKKENIFTTPKYASPGAPRMYMFHAGFRSQFALKFLDQSFVPITNSLTHELQEKPSKWTFNRTAFLHQRQEILQHVDVIKNFSLTKSSVRIGQLMHYDYSSHKYVFSISNNFRSLLPDVSPIMNKRYNVCAVVGNSGILTGSQCGQEIDKSDFVFRCNFAPTEAFHKDVGRKTNLTTFNPSILEKYYNNLLTIQDRNNFFLSLKKLDGAILWIPAFFFHTSATVTRTLVDFFVEHRGQLKVQLAWPGNIMQHVNRYWKNKHLSPKRLSTGILMYTLASAICEEIHLYGFWPFGFDPNTREDLPYHYYDKKGTKFTTKWQESHQLPAEFQLLYRMHGEGLTKLTLSHCA
Predicted GO terms:
Molecular Function (MF): GO:0003674 (molecular function), GO:0003824 (catalytic activity), GO:0016740 (transferase activity), GO:0016757 (glycosyltransferase activity), GO:0008373 (sialyltransferase activity)
Biological Process (BP): GO:0008150 (biological process), GO:0008152 (metabolic process), GO:0009987 (cellular process), GO:0009058 (biosynthetic process), GO:0044237 (cellular metabolic process), GO:0006807 (nitrogen compound metabolic process), GO:0070085 (glycosylation), GO:0071704 (organic substance metabolic process), GO:0044238 (primary metabolic process), GO:1901564 (organonitrogen compound metabolic process), GO:1901576 (organic substance biosynthetic process), GO:0006629 (lipid metabolic process), GO:0019538 (protein metabolic process), GO:0044255 (cellular lipid metabolic process), GO:0044249 (cellular biosynthetic process), GO:0034641 (cellular nitrogen compound metabolic process), GO:0043603 (amide metabolic process), GO:0044260 (cellular macromolecule metabolic process), GO:0043170 (macromolecule metabolic process), GO:0043413 (macromolecule glycosylation), GO:1901135 (carbohydrate derivative metabolic process), GO:0036211 (protein modification process), GO:1901566 (organonitrogen compound biosynthetic process), GO:0009059 (macromolecule biosynthetic process), GO:0006486 (protein glycosylation), GO:0043412 (macromolecule modification), GO:0009100 (glycoprotein metabolic process), GO:0006643 (membrane lipid metabolic process), GO:0006672 (ceramide metabolic process), GO:0043604 (amide biosynthetic process), GO:1903509 (liposaccharide metabolic process), GO:0044271 (cellular nitrogen compound biosynthetic process), GO:0034645 (cellular macromolecule biosynthetic process), GO:1901137 (carbohydrate derivative biosynthetic process), GO:0046467 (membrane lipid biosynthetic process), GO:0008610 (lipid biosynthetic process), GO:0006665 (sphingolipid metabolic process), GO:0006664 (glycolipid metabolic process), GO:0046513 (ceramide biosynthetic process), GO:0030148 (sphingolipid biosynthetic process), GO:0009101 (glycoprotein biosynthetic process), GO:0001573 (ganglioside metabolic process), GO:0009247 (glycolipid biosynthetic process), GO:0006687 (glycosphingolipid metabolic process), GO:0006688 (glycosphingolipid biosynthetic process)
Cellular Component (CC): GO:0005575 (cellular component), GO:0110165 (cellular anatomical entity), GO:0005622 (intracellular anatomical structure), GO:0043226 (organelle), GO:0005737 (cytoplasm), GO:0012505 (endomembrane system), GO:0031410 (cytoplasmic vesicle), GO:0043229 (intracellular organelle), GO:0005768 (endosome), GO:0043227 (membrane-bounded organelle), GO:0055037 (recycling endosome), GO:0005769 (early endosome), GO:0043231 (intracellular membrane-bounded organelle), GO:0031982 (vesicle), GO:0097708 (intracellular vesicle)