Enzymes
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Namehelp_outline
O3-[β-D-galactosyl-(1→3)-N-acetyl-α-D-galactosaminyl]-L-threonyl-[protein]
Identifier
RHEA-COMP:13923
Reactive part
help_outline
- Name help_outline O3-(β-D-galactosyl-(1→3)-N-acetyl-α-D-galactosaminyl)-L-threonine residue Identifier CHEBI:137950 Charge 0 Formula C18H30N2O12 SMILEShelp_outline [C@H]1([C@@H]([C@H]([C@H]([C@H](O1)CO)O)O[C@H]2[C@@H]([C@H]([C@H]([C@H](O2)CO)O)O)O)NC(=O)C)O[C@@H]([C@@H](C(=O)*)N*)C 2D coordinates Mol file for the small molecule Search links Involved in 4 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline UDP-N-acetyl-α-D-glucosamine Identifier CHEBI:57705 (Beilstein: 4286654) help_outline Charge -2 Formula C17H25N3O17P2 InChIKeyhelp_outline LFTYTUAZOPRMMI-CFRASDGPSA-L SMILEShelp_outline CC(=O)N[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@@H]1OP([O-])(=O)OP([O-])(=O)OC[C@H]1O[C@H]([C@H](O)[C@@H]1O)n1ccc(=O)[nH]c1=O 2D coordinates Mol file for the small molecule Search links Involved in 88 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)-[N-acetyl-β-D-glucosaminyl-(1→6)]-N-acetyl-α-D-galactosaminyl}-L-threonyl-[protein]
Identifier
RHEA-COMP:14420
Reactive part
help_outline
- Name help_outline O3-{β-D-galactosyl-(1→3)-[N-acetyl-β-D-glucosaminyl-(1→6)]-N-acetyl-α-D-galactosaminyl}-L-threonine residue Identifier CHEBI:139607 Charge 0 Formula C26H43N3O17 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)CO)O)O)NC(C)=O)[H])O[C@@H]([C@@H](C(*)=O)N*)C)NC(=O)C 2D coordinates Mol file for the small molecule Search links Involved in 3 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 9,431 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 576 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:56216 | RHEA:56217 | RHEA:56218 | RHEA:56219 | |
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| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
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Related reactions help_outline
More general form(s) of this reaction
Publications
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Molecular cloning and expression of a novel beta-1, 6-N-acetylglucosaminyltransferase that forms core 2, core 4, and I branches.
Yeh J.-C., Ong E., Fukuda M.
Mucin-type O-glycans are classified according to their core structures. Among them, cores 2 and 4 are important for having N-acetyllactosamine side chains, which can be further modified to express various functional oligosaccharides. Previously, we discovered by cloning cDNAs that the core 2 branc ... >> More
Mucin-type O-glycans are classified according to their core structures. Among them, cores 2 and 4 are important for having N-acetyllactosamine side chains, which can be further modified to express various functional oligosaccharides. Previously, we discovered by cloning cDNAs that the core 2 branching enzyme, termed core 2 beta-1,6-N-acetylglucosaminyltransferase-leukocyte type (C2GnT-L), is highly homologous to the I branching beta-1, 6-N-acetylglucosaminyltransferase (IGnT) (Bierhuizen, M. F. A., Mattei, M.-G., and Fukuda, M. (1993) Genes Dev. 7, 468-478). Using these homologous sequences as probes, we identified an expressed sequence tag in dbEST, which has significant homology to C2GnT-L and IGnT. This approach, together with 5'and 3' rapid amplification of cDNA ends, yielded a human cDNA that encompasses a whole coding region of an enzyme, termed C2GnT-mucin type (C2GnT-M). C2GnT-M has 48.2 and 33.8% identity with C2GnT-L and IGnT at the amino acid levels. The expression of C2GnT-M cDNA directed the expression of core 2 branched oligosaccharides and I antigen on the cell surface. Moreover, a soluble chimeric C2GnT-M had core 4 branching activity in addition to core 2 and I branching activities. A soluble chimeric C2GnT-L, in contrast, almost exclusively contains core 2 branching activity. Northern blot analysis demonstrated that the C2GnT-M transcripts are heavily expressed in colon, small intestine, trachea, and stomach, where mucin is produced. In contrast, the transcripts of C2GnT-L were more widely detected, including the lymph node and bone marrow. These results indicate that the newly cloned C2GnT-M plays a critical role in O-glycan synthesis in mucins and might have distinctly different roles in oligosaccharide ligand formation compared with C2GnT-L. << Less
J. Biol. Chem. 274:3215-3221(1999) [PubMed] [EuropePMC]
This publication is cited by 5 other entries.
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A multipotential beta -1,6-N-acetylglucosaminyl-transferase is encoded by bovine herpesvirus type 4.
Vanderplasschen A., Markine-Goriaynoff N., Lomonte P., Suzuki M., Hiraoka N., Yeh J.-C., Bureau F., Willems L., Thiry E., Fukuda M., Pastoret P.-P.
The beta-1,6-N-acetylglucosaminyltransferase (beta1,6GnT) gene family encodes enzymes playing crucial roles in glycan synthesis. Important changes in beta1,6GnT expression are observed during development, oncogenesis, and immunodeficiency. The most characterized beta1,6GnTs in this gene family are ... >> More
The beta-1,6-N-acetylglucosaminyltransferase (beta1,6GnT) gene family encodes enzymes playing crucial roles in glycan synthesis. Important changes in beta1,6GnT expression are observed during development, oncogenesis, and immunodeficiency. The most characterized beta1,6GnTs in this gene family are the human (h) C2GnT-L and h-IGnT, which have core 2 [Galbeta1-->3(GlcNAcbeta1-->6)GalNAc] and I branching [GlcNAcbeta1-->3(GlcNAcbeta1-->6)Gal] activities, respectively. Recently, h-C2GnT-M was shown to be unique in forming core 2, core 4 [GlcNAcbeta1-->3(GlcNAcbeta1-->6)GalNAc], and I structures. To date, the beta1,6GnT gene family has been characterized only in mammals. Here, we describe that bovine herpesvirus type 4 (BHV-4) encodes a beta1,6GnT expressed during viral replication and exhibiting all of the core 2, core 4, and I branching activities. Sequencing of the BHV-4 genome revealed an ORF, hereafter called BORFF3-4, encoding a protein (pBORFF3-4) exhibiting 81.1%, 50.7%, and 36.6% amino acid identity with h-C2GnT-M, h-C2GnT-L, and h-IGnT, respectively. Reverse transcriptase-PCR analysis revealed that BORFF3-4 is expressed during BHV-4 replication. Expression of BORFF3-4 in Chinese hamster ovary cells directed the expression of core 2 branched oligosaccharides and I antigenic structures on the cell surface. Moreover, a soluble form of pBORFF3-4 had core 4 branching activity in addition to core 2 and I branching activities. Finally, infection of a C2GnT-negative cell line with BHV-4 induced expression of core 2 branched oligosaccharides. This study extends the beta1,6GnT gene family to a viral gene and provides a model to study the biological functions of a beta1,6GnT in the context of viral infection. << Less
Proc. Natl. Acad. Sci. U.S.A. 97:5756-5761(2000) [PubMed] [EuropePMC]
This publication is cited by 4 other entries.
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The separation by liquid chromatography (under elevated pressure) of phenyl, benzyl, and O-nitrophenyl glycosides of oligosaccharides. Analysis of substrates and products for four N-acetyl-D-glucosaminyl-transferases involved in mucin synthesis.
Brockhausen I., Rachaman E.S., Matta K.L., Schachter H.
Liquid chromatography under elevated pressure (h.p.l.c.) has been applied to the separation of the phenyl, benzyl, and O-nitrophenyl glycosides of 2-acetamido-2-deoxy-D-galactopyranose and of various mucin-type, di-, tri-, and tetra-saccharides. The separations were carried out with a Whatman Part ... >> More
Liquid chromatography under elevated pressure (h.p.l.c.) has been applied to the separation of the phenyl, benzyl, and O-nitrophenyl glycosides of 2-acetamido-2-deoxy-D-galactopyranose and of various mucin-type, di-, tri-, and tetra-saccharides. The separations were carried out with a Whatman Partisil PXS 5/25 PAC column and various proportions of acetonitrile and water in the mobile phase. These methods were subsequently used to separate the substrates and products of the following N-acetylglucosaminyltransferase reactions: UDP-GlcNAc + beta-Gal-(1 leads to 3)-GalNAc-R leads to beta-Gal-(1 leads to 3)-[beta-GlcNAc-(1 leads to 6)]-GalNAc-R + UDP (1); UDP-GlcNAc + beta-Gal-(1 leads to 3)-[beta-GlcNAc-(1 leads to 6)]-GalNAc-R leads to beta-GlcNAc-(1 leads to 3)-beta-Gal-(1 leads to 3)-[beta-GlcNAc-(1 leads to 6)]-GalNAc-R + UDP (2); UDP-GlcNAc + GalNAc-R' leads to beta-GlcNAc-(1 leads to 3)-GalNAc-R' + UDP (3); and UDP-GlcNAc + beta-GlcNAc-(1 leads to 3)-GalNAc-R' leads to beta-GlcNAc-(1 leads to 6)-[beta-GlcNAc-(1 leads to 3)]-GalNAc-R' + UDP (4), where R is = benzyl or o-nitrophenyl, and R' = benzyl or phenyl alpha-D-glycoside. Reaction 1 is catalyzed by a transferase in canine submaxillary glands and porcine gastric mucosa, and reaction 2 by an enzyme in porcine gastric mucosa. Enzyme activities catalyzing reactions 3 and 4 have recently been demonstrated in rat colonic mucosa. Liquid chromatography can be used at the preparative level for the purification and identification of the transferase products, and at the analytical level in the assay of glycosyltransferases. << Less
Carbohydr Res 120:3-16(1983) [PubMed] [EuropePMC]
This publication is cited by 8 other entries.
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Mucin synthesis. II. Substrate specificity and product identification studies on canine submaxillary gland UDP-GlcNAc:Gal beta 1-3GalNAc(GlcNAc leads to GalNAc) beta 6-N-acetylglucosaminyltransferase.
Williams D., Longmore G., Matta K.L., Schachter H.
The preceding paper (Williams, D., and Schachter, H. (1980) J. Biol. Chem. 255, 0000-0000) described a novel N-acetylglucosaminyltransferase in canine submaxillary gland microsomes which catalyzed the incorporation of GlcNAc into mucin acceptors. We show in the present report that the enzyme catal ... >> More
The preceding paper (Williams, D., and Schachter, H. (1980) J. Biol. Chem. 255, 0000-0000) described a novel N-acetylglucosaminyltransferase in canine submaxillary gland microsomes which catalyzed the incorporation of GlcNAc into mucin acceptors. We show in the present report that the enzyme catalyzes th following reaction: UDP-GlcNAc + Gal beta 1-3GalNAc-X leads to Gal beta 1-3(GlcNAc beta 1-6) GalNAc-X + UDP, where X can be porcine submaxillary mucin polypeptide (Km = 5.2 mM), antifreeze glycoprotein polypeptide (Km = 23 mM), alpha-O-p-nitrophenyl (Km = 0.52 mM), beta-O-p-nitrophenyl (Km = 0.92 mM), alpha-O-o-nitrophenyl (Km = 0.86 mM), alpha-O-benzyl (Km = 0.77 mM), alpha-O-methyl (Km = 4.2 mM), or -H (Km = 1.2 mM). Ineffective acceptors (< 5% of the activity with Gal beta 1-3GalNAc-alpha-p-nitrophenyl) are asialo-ovine submaxillary mucin, asialo-alpha 1 acid glycoprotein, Gal beta 1-3GlcNAc-beta-p-nitrophenyl, Gal beta 1-3GlcNAc-alpha-methyl, Gal beta1-3GlcNAc, Gal beta 1-3-N-acetylgalactosaminitol, and D-fucose beta 1-3GalNAc-alpha-benzyl, indicating that both the Gal and GalNAc residues are essential for acceptor activity. The beta 1 leads to 6-linkage of GlcNAc to GalNAc in the acceptor Gal beta 1-3GalNAc-alpha-O-benzyl was established by methylation analysis and high resolution 1H nuclear magnetic resonance spectroscopy of a large scale preparation of product. Preliminary evidence has been obtained indicating that sialic acid linked alpha 2-6 to GalNAc or L-fucose linked alpha 1-2 to Gal inhibit the action of the beta 6-N-acetylglucosaminyltransferase on Gal beta 1-3GalNAc-porcine submaxillary mucin polypeptide. << Less
J Biol Chem 255:11253-11261(1980) [PubMed] [EuropePMC]
This publication is cited by 2 other entries.
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Control of O-glycan branch formation. Molecular cloning and characterization of a novel thymus-associated core 2 beta1, 6-n-acetylglucosaminyltransferase.
Schwientek T., Yeh J.-C., Levery S.B., Keck B., Merkx G., van Kessel A.G., Fukuda M., Clausen H.
Core 2 O-glycan branching catalyzed by UDP-N-acetyl-alpha-D-glucosamine: acceptor beta1, 6-N-acetylglucosaminyltransferases (beta6GlcNAc-Ts) is an important step in mucin-type biosynthesis. Core 2 complex-type O-glycans are involved in selectin-mediated adhesion events, and O-glycan branching appe ... >> More
Core 2 O-glycan branching catalyzed by UDP-N-acetyl-alpha-D-glucosamine: acceptor beta1, 6-N-acetylglucosaminyltransferases (beta6GlcNAc-Ts) is an important step in mucin-type biosynthesis. Core 2 complex-type O-glycans are involved in selectin-mediated adhesion events, and O-glycan branching appears to be highly regulated. Two homologous beta6GlcNAc-Ts functioning in O-glycan branching have previously been characterized, and here we report a third homologous beta6GlcNAc-T designated C2GnT3. C2GnT3 was identified by BLAST analysis of human genome survey sequences. The catalytic activity of C2GnT3 was evaluated by in vitro analysis of a secreted form of the protein expressed in insect cells. The results revealed exclusive core 2 beta6GlcNAc-T activity. The product formed with core 1-para-nitrophenyl was confirmed by (1)H NMR to be core 2-para-nitrophenyl. In vivo analysis of the function of C2GnT3 by coexpression of leukosialin (CD43) and a full coding construct of C2GnT3 in Chinese hamster ovary cells confirmed the core 2 activity and failed to reveal I activity. The C2GnT3 gene was located to 5q12, and the coding region was contained in a single exon. Northern analysis revealed selectively high levels of a 5.5-kilobase C2GnT3 transcript in thymus with only low levels in other organs. The unique expression pattern of C2GnT3 suggests that this enzyme serves a specific function different from other members of the beta6GlcNAc-T gene family. << Less
J. Biol. Chem. 275:11106-11113(2000) [PubMed] [EuropePMC]
This publication is cited by 2 other entries.
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Mucin synthesis. I. Detection in canine submaxillary glands of an N-acetylglucosaminyltransferase which acts on mucin substrates.
Williams D., Schachter H.
Canine submaxillary gland microsomes have been shown to catalyze the following reaction: UDP-GlcNAc + Gal beta 1-3GalNAc-X leads to Gal beta 1-3(GlcNAc)GalNAc-X + UDP where X is porcine or ovine submaxillary mucin polypeptide or a low molecular weight substituent. This activity was shown by mixed ... >> More
Canine submaxillary gland microsomes have been shown to catalyze the following reaction: UDP-GlcNAc + Gal beta 1-3GalNAc-X leads to Gal beta 1-3(GlcNAc)GalNAc-X + UDP where X is porcine or ovine submaxillary mucin polypeptide or a low molecular weight substituent. This activity was shown by mixed substrate experiments to be different from two other previously described glycoprotein N-acetylglucosaminyltransferases acting on N-glycosyl oligosaccharides and is the first N-acetylglucosaminyltransferase shown to act on mucin substrates. The transferase-catalyzed reaction proceeds at 70 to 80% of the optimum rate in the absence of added divalent cation or in the presence of 10 mM EDTA. The enzyme appeared to be unstable at 37 degrees C, but the reaction rate remained constant for at least 2 h at 25 degrees C. The enzyme showed a pH optimum of 7.0 and was stimulated 4-fold by 0.125% Triton X-100. Methylation analysis of product formed either with mucin acceptor or Gal beta 1-3GalNAc-alpha-O-benzyl indicated GlcNAc transfer to either carbon 4 or carbon 6 of the GalNAc residue of the acceptors. << Less
J Biol Chem 255:11247-11252(1980) [PubMed] [EuropePMC]
This publication is cited by 2 other entries.