Enzymes
| UniProtKB help_outline | 3 proteins |
Reaction participants Show >> << Hide
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Namehelp_outline
3-O-{β-D-galactosyl-(1→3)-[6-O-sulfo-N-acetyl-β-D-glucosaminyl-(1→6)]-N-acetyl-α-D-galactosaminyl}-L-seryl-[protein]
Identifier
RHEA-COMP:17367
Reactive part
help_outline
- Name help_outline O3-{β-D-galactosyl-(1→3)-[6-O-sulfo-N-acetyl-β-D-glucosaminyl-(1→6)]-N-acetyl-α-D-galactosaminyl}-L-serine residue Identifier CHEBI:176494 Charge -1 Formula C25H40N3O20S SMILEShelp_outline [C@@H]1([C@H](O[C@@H]([C@@H]([C@@H]1O[C@H]2[C@@H]([C@H]([C@H]([C@H](O2)CO)O)O)O)O)CO[C@]3([C@@H]([C@H]([C@@H]([C@H](O3)COS(=O)(=O)[O-])O)O)NC(C)=O)[H])OC[C@@H](C(*)=O)N*)NC(=O)C 2D coordinates Mol file for the small molecule Search links Involved in 2 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline UDP-α-D-galactose Identifier CHEBI:66914 Charge -2 Formula C15H22N2O17P2 InChIKeyhelp_outline HSCJRCZFDFQWRP-ABVWGUQPSA-L SMILEShelp_outline OC[C@H]1O[C@H](OP([O-])(=O)OP([O-])(=O)OC[C@H]2O[C@H]([C@H](O)[C@@H]2O)n2ccc(=O)[nH]c2=O)[C@H](O)[C@@H](O)[C@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 124 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
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Namehelp_outline
3-O-{β-D-galactosyl-(1→3)-[β-D-galactosyl-(1→4)-6-O-sulfo-N-acetyl-β-D-glucosaminyl-(1→6)]-N-acetyl-α-D-galactosaminyl}-L-seryl-[protein]
Identifier
RHEA-COMP:17398
Reactive part
help_outline
- Name help_outline O3-{β-D-galactosyl-(1→3)-[β-D-galactosyl-(1→4)-6-O-sulfo-N-acetyl-β-D-glucosaminyl-(1→6)]-N-acetyl-α-D-galactosaminyl}-L-serine residue Identifier CHEBI:176635 Charge -1 Formula C31H50N3O25S SMILEShelp_outline [C@@H]1([C@H](O[C@@H]([C@@H]([C@@H]1O[C@H]2[C@@H]([C@H]([C@H]([C@H](O2)CO)O)O)O)O)CO[C@]3([C@@H]([C@H]([C@@H]([C@H](O3)COS(=O)(=O)[O-])O[C@H]4[C@@H]([C@H]([C@H]([C@H](O4)CO)O)O)O)O)NC(C)=O)[H])OC[C@@H](C(*)=O)N*)NC(=O)C 2D coordinates Mol file for the small molecule Search links Involved in 1 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline UDP Identifier CHEBI:58223 Charge -3 Formula C9H11N2O12P2 InChIKeyhelp_outline XCCTYIAWTASOJW-XVFCMESISA-K SMILEShelp_outline O[C@@H]1[C@@H](COP([O-])(=O)OP([O-])([O-])=O)O[C@H]([C@@H]1O)n1ccc(=O)[nH]c1=O 2D coordinates Mol file for the small molecule Search links Involved in 637 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline H+ Identifier CHEBI:15378 Charge 1 Formula H InChIKeyhelp_outline GPRLSGONYQIRFK-UHFFFAOYSA-N SMILEShelp_outline [H+] 2D coordinates Mol file for the small molecule Search links Involved in 9,932 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:67948 | RHEA:67949 | RHEA:67950 | RHEA:67951 | |
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| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
| UniProtKB help_outline |
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Publications
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Beta 1,4-galactosyltransferase (beta 4GalT)-IV is specific for GlcNAc 6-O-sulfate. Beta 4GalT-IV acts on keratan sulfate-related glycans and a precursor glycan of 6-sulfosialyl-Lewis X.
Seko A., Dohmae N., Takio K., Yamashita K.
The Galbeta1-->4(SO(3)(-)-->6)GlcNAc moiety is present in various N-linked and O-linked glycans including keratan sulfate and 6-sulfosialyl-Lewis X, an L-selectin ligand. We previously found beta1,4-galactosyltransferase (beta4GalT) activity in human colonic mucosa, which prefers GlcNAc 6-O-sulfat ... >> More
The Galbeta1-->4(SO(3)(-)-->6)GlcNAc moiety is present in various N-linked and O-linked glycans including keratan sulfate and 6-sulfosialyl-Lewis X, an L-selectin ligand. We previously found beta1,4-galactosyltransferase (beta4GalT) activity in human colonic mucosa, which prefers GlcNAc 6-O-sulfate (6SGN) as an acceptor to non-substituted GlcNAc (Seko, A., Hara-Kuge, S., Nagata, K., Yonezawa, S., and Yamashita, K. (1998) FEBS Lett. 440, 307-310). To identify the gene for this enzyme, we purified the enzyme from porcine colonic mucosa. The purified enzyme had the characteristic requirement of basic lipids for catalytic activity. Analysis of the partial amino acid sequence of the enzyme revealed that the purified beta4GalT has a similar sequence to human beta4GalT-IV. To confirm this result, we prepared cDNA for each of the seven beta4GalTs cloned to date and examined substrate specificities using the membrane fractions derived from beta4GalT-transfected COS-7 cells. When using several N-linked and O-linked glycans with or without 6SGN residues as acceptor substrates, only beta4GalT-IV efficiently recognized 6SGN, keratan sulfate-related oligosaccharides, and Galbeta1-->3(SO(3)(-)-->6GlcNAcbeta1-->6) GalNAcalpha1-O-pNP, a precursor for 6-sulfosialyl-Lewis X. These results suggested that beta4GalT-IV is a 6SGN-specific beta4GalT and may be involved in the biosynthesis of various glycoproteins carrying a 6-O-sulfated N-acetyllactosamine moiety. << Less
J. Biol. Chem. 278:9150-9158(2003) [PubMed] [EuropePMC]
This publication is cited by 1 other entry.
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Impaired selectin-ligand biosynthesis and reduced inflammatory responses in beta-1,4-galactosyltransferase-I-deficient mice.
Asano M., Nakae S., Kotani N., Shirafuji N., Nambu A., Hashimoto N., Kawashima H., Hirose M., Miyasaka M., Takasaki S., Iwakura Y.
Selectins recognize ligands containing carbohydrate chains such as sialyl Lewis x (sLex) that are mainly presented at the terminus of N-acetyl lactosamine repeats on core 2 O-glycans. Several glycosyltransferases act successively to extend the N-acetyl lactosamine repeats and to synthesize sLex, a ... >> More
Selectins recognize ligands containing carbohydrate chains such as sialyl Lewis x (sLex) that are mainly presented at the terminus of N-acetyl lactosamine repeats on core 2 O-glycans. Several glycosyltransferases act successively to extend the N-acetyl lactosamine repeats and to synthesize sLex, and beta-1,4-galactosyltransferase (beta4GalT) plays a key role in these processes. Recently isolated 6 beta4GalT genes are candidates, but their individual roles, including those in selectin-ligand biosynthesis, remain to be elucidated. More than 80% of the core 2 O-glycans on the leukocyte membrane glycoproteins of beta4GalT-I-deficient mice lacked galactose residues in beta-1,4 linkage, and soluble P-selectin binding to neutrophils and monocytes of these mice was significantly reduced, indicating an impairment of selectin-ligand biosynthesis. beta4GalT-I-deficient mice exhibited blood leukocytosis but normal lymphocyte homing to peripheral lymph nodes. Acute and chronic inflammatory responses, including the contact hypersensitivity (CHS) and delayed-type hypersensitivity (DTH) responses, were suppressed, and neutrophil infiltration into inflammatory sites was largely reduced in these mice. Our results demonstrate that beta4GalT-I is a major galactosyltransferase responsible for selectin-ligand biosynthesis and that inflammatory responses of beta4GalT-I-deficient mice are impaired because of the defect in selectin-ligand biosynthesis. << Less
Blood 102:1678-1685(2003) [PubMed] [EuropePMC]
This publication is cited by 1 other entry.