Enzymes
| UniProtKB help_outline | 2 proteins |
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Namehelp_outline
3-O-[N-acetyl-α-D-galactosaminyl]-L-threonyl-[protein]
Identifier
RHEA-COMP:11689
Reactive part
help_outline
- Name help_outline N-acetyl-α-D-galactosaminyl-L-threonine residue Identifier CHEBI:87075 Charge 0 Formula C12H20N2O7 SMILEShelp_outline C[C@H]([C@@H](C(*)=O)N*)O[C@@H]1[C@@H]([C@H]([C@H]([C@H](O1)CO)O)O)NC(=O)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-[N-acetyl-β-D-glucosaminyl-(1→3)-N-acetyl-α-D-galactosaminyl]-L-threonyl-[protein]
Identifier
RHEA-COMP:11692
Reactive part
help_outline
- Name help_outline N-acetyl-β-D-glucosaminyl-(1→3)-N-acetyl-α-D-galactosaminyl-L-threonine residue Identifier CHEBI:87080 Charge 0 Formula C20H33N3O12 SMILEShelp_outline C[C@@H](O[C@H]1O[C@H](CO)[C@H](O)[C@H](O[C@@H]2O[C@H](CO)[C@@H](O)[C@H](O)[C@H]2NC(C)=O)[C@H]1NC(C)=O)[C@H](N-*)C(-*)=O 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 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 9,176 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 542 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:46880 | RHEA:46881 | RHEA:46882 | RHEA:46883 | |
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| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
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Publications
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Mucin synthesis. UDP-GlcNAc:GalNAc-R beta 3-N-acetylglucosaminyltransferase and UDP-GlcNAc:GlcNAc beta 1-3GalNAc-R (GlcNAc to GalNAc) beta 6-N-acetylglucosaminyltransferase from pig and rat colon mucosa.
Brockhausen I., Matta K.L., Orr J., Schachter H.
Pig and rat colon mucosal membrane preparations catalyze the in vitro transfer of N-acetyl-D-glucosamine (GlcNAc) from UDP-GlcNAc to GalNAc-ovine submaxillary mucin to form GlcNAc beta 1-3GalNAc-mucin. Rat colon also catalyzes the in vitro transfer of GlcNAc from UDP-GlcNAc to GlcNAc beta 1-3GalNA ... >> More
Pig and rat colon mucosal membrane preparations catalyze the in vitro transfer of N-acetyl-D-glucosamine (GlcNAc) from UDP-GlcNAc to GalNAc-ovine submaxillary mucin to form GlcNAc beta 1-3GalNAc-mucin. Rat colon also catalyzes the in vitro transfer of GlcNAc from UDP-GlcNAc to GlcNAc beta 1-3GalNAc-mucin to form GlcNAc beta 1-3(GlcNAc beta 1-6) GalNAc-mucin. This is the first demonstration of in vitro synthesis of the GlcNAc beta 1-3GalNAc disaccharide and of the GlcNAc beta 1-3-(GlcNAc beta 1-6)GalNAc trisaccharide, two of the four major core types found in mammalian glycoproteins of the mucin type, i.e., those containing oligosaccharides with GalNAc-alpha-serine (threonine) linkages. The activity catalyzing synthesis of the disaccharide has been named UDP-GlcNAc:GalNAc-R beta 3-N-acetylglucosaminyltransferase (mucin core 3 beta 3-GlcNAc-transferase), while the activity responsible for synthesizing the trisaccharide has been named UDP-GlcNAc:GlcNAc beta 1-3GalNAc-R (GlcNAc to GalNAc) beta 6-N-acetylglucosaminyltransferase (mucin core 4 beta 6-GlcNAc-transferase). The beta 3-GlcNAc-transferase from pig colon is activated by Triton X-100, has an absolute requirement for Mn2+, and transfers GlcNAc to GalNAc-alpha-phenyl, GalNAc-alpha-benzyl, and GalNAc-ovine submaxillary mucin with apparent Km values of 5, 2, and 3 mM and Vmax values of 59, 62, and 37 nmol h-1 (mg of protein)-1, respectively.(ABSTRACT TRUNCATED AT 250 WORDS) << Less
Biochemistry 24:1866-1874(1985) [PubMed] [EuropePMC]
This publication is cited by 3 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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Synthesis of O-glycan core 3: characterization of UDP-GlcNAc: GalNAc-R beta 3-N-acetyl-glucosaminyltransferase activity from colonic mucosal tissues and lack of the activity in human cancer cell lines.
Vavasseur F., Yang J.M., Dole K., Paulsen H., Brockhausen I.
UDP-GlcNAc: GalNAc-R beta 3-GlcNAc-transferase (core 3 beta 3-GlcNAc-T, where GlcNAc is N-acetyl-D-glucosamine, GalNAc is N-acetyl-D-galactosamine and T is transferase) is expressed in a tissue-specific fashion and is high in normal colonic tissue, but downregulated in colon cancer. To further stu ... >> More
UDP-GlcNAc: GalNAc-R beta 3-GlcNAc-transferase (core 3 beta 3-GlcNAc-T, where GlcNAc is N-acetyl-D-glucosamine, GalNAc is N-acetyl-D-galactosamine and T is transferase) is expressed in a tissue-specific fashion and is high in normal colonic tissue, but downregulated in colon cancer. To further study the control of this enzyme, we examined the activity in pig, rat and human colonic tissues, and several human cancer cell lines. The enzyme was difficult to solubilize by detergents and was extremely unstable in the solubilized form. Using synthetic derivatives of the GalNAc-R substrate, we showed that the specificity of the enzyme in normal rat and human colonic mucosa requires all the substituents of the GalNAc-sugar ring of substrates for maximal activity. Core 3 beta 3-GlcNAc-T was significantly influenced by the structure of the aglycon group. None of the inactive substrate derivatives could inhibit the activity. N-Iodoacetamido-galactosamine alpha-benzyl was a weak substrate and significantly inhibited the incorporation of GLcNAc into GalNAc alpha-benzyl by human colonic homogenates. Surprisingly, none of the colonic cancer cell lines or any other cancer and leukaemia cells examined exhibited detectable activity of the enzyme, although a number of other glycosyltransferase activities involved in O-glycan biosynthesis were active. Mixing experiments did not reveal an endogenous inhibitor in HL60 cells or an activator of core 3 beta 3-GlcNAc-T in human colonic mucosa. Thus, the lack of core 3 beta 3-GlcNAc-T in human colonic mucosa. Thus, the lack of core 3 beta 3-GlcNAc-T activity in cancer cell lines may be due to cell transformation or cell culturing. << Less
Glycobiology 5:351-357(1995) [PubMed] [EuropePMC]
This publication is cited by 1 other entry.