Rhea - reaction knowledgebase

Enzymes

UniProtKB ^help_outline	1 proteins
Enzyme class ^help_outline	EC 2.4.1.201 alpha-1,6-mannosyl-glycoprotein 4-beta-N-acetylglucosaminyltransferase
GO Molecular Function ^help_outline	GO:0047253 alpha-1,6-mannosylglycoprotein 4-beta-N-acetylglucosaminyltransferase activity

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Name^help_outline N⁴-{β-D-GlcNAc-(1→2)-[β-D-GlcNAc-(1→4)]-α-D-Man-(1→3)-[β-D-GlcNAc-(1→2)-[β-D-GlcNAc-(1→6)]-α-D-Man-(1→6)]-β-D-Man-(1→4)-β-D-GlcNAc-(1→4)-β-D-GlcNAc}-L-asparaginyl-[protein] Identifier RHEA-COMP:14377 Reactive part ^help_outline
- Name ^help_outline N⁴-{β-D-GlcNAc-(1→2)-[β-D-GlcNAc-(1→4)]-α-D-Man-(1→3)-[β-D-GlcNAc-(1→2)-[β-D-GlcNAc-(1→6)]-α-D-Man-(1→6)]-β-D-Man-(1→4)-β-D-GlcNAc-(1→4)-β-D-GlcNAc}-L-Asn residue Identifier CHEBI:139510 Charge 0 Formula C70H114N8O47 SMILES^help_outline [C@H]1([C@H]([C@H]([C@@H]([C@H](O1)CO)O[C@H]2[C@@H]([C@H]([C@@H]([C@H](O2)CO)O)O)NC(C)=O)O)O[C@H]3[C@@H]([C@H]([C@@H]([C@H](O3)CO)O)O)NC(C)=O)O[C@@H]4[C@@H]([C@@H](O[C@@H]([C@H]4O)CO[C@@H]5[C@H]([C@H]([C@@H]([C@H](O5)CO[C@]6([C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)NC(=O)C)[H])O)O)O[C@H]7[C@@H]([C@H]([C@@H]([C@H](O7)CO)O)O)NC(=O)C)O[C@H]8[C@@H]([C@H]([C@@H](O[C@@H]8CO)O[C@H]9[C@@H]([C@H]([C@@H](O[C@@H]9CO)NC(C[C@@H](C(=O)*)N*)=O)NC(C)=O)O)NC(C)=O)O)O 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
Search links Involved in 3 reaction(s) 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 InChIKey^help_outline LFTYTUAZOPRMMI-CFRASDGPSA-L SMILES^help_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
Name ^help_outline H⁺ Identifier CHEBI:15378 Charge 1 Formula H InChIKey^help_outline GPRLSGONYQIRFK-UHFFFAOYSA-N SMILES^help_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 N⁴-{β-D-GlcNAc-(1→2)-[β-D-GlcNAc-(1→4)]-α-D-Man-(1→3)-[β-D-GlcNAc-(1→2)-[β-D-GlcNAc-(1→4)]-[β-D-GlcNAc-(1→6)]-α-D-Man-(1→6)]-β-D-Man-(1→4)-β-D-GlcNAc-(1→4)-β-D-GlcNAc}-L-asparaginyl-[protein] Identifier RHEA-COMP:14384 Reactive part ^help_outline
- Name ^help_outline N⁴-{β-D-GlcNAc-(1→2)-[β-D-GlcNAc-(1→4)]-α-D-Man-(1→3)-[β-D-GlcNAc-(1→2)-[β-D-GlcNAc-(1→4)]-[β-D-GlcNAc-(1→6)]-α-D-Man-(1→6)]-β-D-Man-(1→4)-β-D-GlcNAc-(1→4)-β-D-GlcNAc}-L-Asn residue Identifier CHEBI:139513 Charge 0 Formula C78H127N9O52 SMILES^help_outline [C@H]1([C@H]([C@H]([C@@H]([C@H](O1)CO)O[C@H]2[C@@H]([C@H]([C@@H]([C@H](O2)CO)O)O)NC(C)=O)O)O[C@H]3[C@@H]([C@H]([C@@H]([C@H](O3)CO)O)O)NC(C)=O)O[C@@H]4[C@@H]([C@@H](O[C@@H]([C@H]4O)CO[C@@H]5[C@H]([C@H]([C@@H]([C@H](O5)CO[C@]6([C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)NC(=O)C)[H])O[C@H]7[C@@H]([C@H]([C@@H]([C@H](O7)CO)O)O)NC(=O)C)O)O[C@H]8[C@@H]([C@H]([C@@H]([C@H](O8)CO)O)O)NC(=O)C)O[C@H]9[C@@H]([C@H]([C@@H](O[C@@H]9CO)O[C@H]%10[C@@H]([C@H]([C@@H](O[C@@H]%10CO)NC(C[C@@H](C(=O)*)N*)=O)NC(C)=O)O)NC(C)=O)O)O 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
Search links Involved in 1 reaction(s) Find proteins in UniProtKB for this molecule
Name ^help_outline UDP Identifier CHEBI:58223 Charge -3 Formula C9H11N2O12P2 InChIKey^help_outline XCCTYIAWTASOJW-XVFCMESISA-K SMILES^help_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:19945	RHEA:19946	RHEA:19947	RHEA:19948
Reaction direction	undefined	left-to-right	right-to-left	bidirectional
UniProtKB ^help_outline	1 proteins
EC numbers ^help_outline	2.4.1.201
Gene Ontology ^help_outline	GO:0047253
KEGG ^help_outline				R05992
MetaCyc ^help_outline		2.4.1.201-RXN

Publications

Control of glycoprotein synthesis. Detection and characterization of a novel branching enzyme from hen oviduct, UDP-N-acetylglucosamine:GlcNAc beta 1-6 (GlcNAc beta 1-2)Man alpha-R (GlcNAc to Man) beta-4-N-acetylglucosaminyltransferase VI.

Brockhausen I., Hull E., Hindsgaul O., Schachter H., Shah R.N., Michnick S.W., Carver J.P.

Hen oviduct membranes were shown to contain high activity of a novel enzyme, UDP-GlcNac:GlcNAc beta 1-6(GlcNAc beta 1-2) Man alpha-R (GlcNAc to Man) beta 4-GlcNAc-transferase VI. The enzyme was shown to transfer GlcNAc in beta 1-4 linkage to the D-mannose residue of GlcNAc beta 1-6 (GlcNAc beta 1- ... >> More

Hen oviduct membranes were shown to contain high activity of a novel enzyme, UDP-GlcNac:GlcNAc beta 1-6(GlcNAc beta 1-2) Man alpha-R (GlcNAc to Man) beta 4-GlcNAc-transferase VI. The enzyme was shown to transfer GlcNAc in beta 1-4 linkage to the D-mannose residue of GlcNAc beta 1-6 (GlcNAc beta 1-2) Man alpha-R where R is either 1-6Man beta-(CH2)8COOCH3 or methyl. Radioactive enzyme products were purified by several chromatographic steps, including high performance liquid chromatography, and structures were determined by proton nmr, fast atom bombardment-mass spectrometry, and methylation analysis to be GlcNAc beta 1-6 ([14C]GlcNAc beta 1-4) (GlcNAc beta 1-2) Man alpha-R. The enzyme is stimulated by Triton X-100 and has optimum activity at a relatively high MnCl2 concentration of about 100 mM; Co2+, Mg2+, and Ca2+ could partially substitute for Mn2+. A tissue survey demonstrated high GlcNAc-transferase VI activity in hen oviduct and lower activity in chicken liver and colon, duck colon, and turkey intestine. No activity was found in mammalian tissues. Hen oviduct membranes cannot act on GlcNAc beta 1-6Man alpha-R but have a beta 4-GlcNAc-transferase activity that converts GlcNAc beta 1-2Man alpha-R to GlcNAc beta 1-4(GlcNAc beta 1-2) Man alpha-R where R is either 1-6Man beta-(CH2)8COOCH3 or 1-6Man beta methyl. The latter activity is probably due to GlcNAc-transferase IV which preferentially adds GlcNAc in beta 1-4 linkage to the Man alpha 1-3 arm of the GlcNAc beta 1-2Man alpha 1-6(GlcNAc beta 1-2Man alpha 1-3)Man beta 1-4GlcNAc beta 1-4GlcNAc-Asn core structure of asparagine-linked glycans. The minimum structural requirement for a substrate of beta 4-GlcNAc-transferase VI is therefore the trisaccharide GlcNAc beta 1-6(GlcNAc beta 1-2) Man alpha-; this trisaccharide is found on the Man alpha 6 arm of many branched complex asparagine-linked oligosaccharides. The data suggest that GlcNAc-transferase VI acts after the synthesis of the GlcNAc beta 1-2Man alpha 1-3-, GlcNAc beta 1-2Man alpha 1-6-, and GlcNAc beta 1-6 Man alpha 1-6-branches by GlcNAc-transferases I, II, and V, respectively, and is responsible for the synthesis of branched oligosaccharides containing the GlcNAc beta 1-6(GlcNAc beta 1-4)(GlcNAc beta 1-2)Man alpha 1-6Man beta moiety. << Less

J Biol Chem 264:11211-11221(1989) [PubMed] [EuropePMC]
Molecular cloning and expression of cDNA encoding chicken UDP-N-acetyl-D-glucosamine (GlcNAc): GlcNAcbeta 1-6(GlcNAcbeta 1-2)-manalpha 1-R[GlcNAc to man]beta 1,4N-acetylglucosaminyltransferase VI.

Sakamoto Y., Taguchi T., Honke K., Korekane H., Watanabe H., Tano Y., Dohmae N., Takio K., Horii A., Taniguchi N.

A cDNA that encodes UDP-N-acetyl-d-glucosamine (GlcNAc):GlcNAcbeta1-6(GlcNAcbeta1-2)Manalpha1-R[GlcNA c to Man]beta1, 4N-acetylglucosaminyltransferase VI (GnT VI), which is responsible for the formation of pentaantennary asparagine-linked oligosaccharides (N-glycans), has been cloned from a hen ov ... >> More

A cDNA that encodes UDP-N-acetyl-d-glucosamine (GlcNAc):GlcNAcbeta1-6(GlcNAcbeta1-2)Manalpha1-R[GlcNA c to Man]beta1, 4N-acetylglucosaminyltransferase VI (GnT VI), which is responsible for the formation of pentaantennary asparagine-linked oligosaccharides (N-glycans), has been cloned from a hen oviduct cDNA library based on the partial amino acid sequences of the purified enzyme. The isolated cDNA clone contained an open reading frame encoding 464 amino acids, including all of the peptides that were sequenced. The deduced amino acid sequence predicts a type II transmembrane topology and contains two potential N-glycosylation sites. The primary structure was found to be significantly similar to human GnT IV-homologue, the gene for which was cloned from the deleted region in pancreatic cancer, and to human and bovine GnT IVs. Chicken GnT VI-transfected COS-1 cells showed a high GnT VI activity (26.8 pmol/h/mg protein), whereas nontransfected, mock-transfected, or human GnT IV-homologue-transfected COS-1 cells had no activity. Northern blot analysis using poly(A)(+) RNA from hen oviduct indicated that the size of GnT VI mRNA is 2.1 kilobases. Reverse transcription-polymerase chain reaction analysis showed that GnT VI mRNA was relatively highly expressed in oviduct, spleen, lung, and colon. << Less

J. Biol. Chem. 275:36029-36034(2000) [PubMed] [EuropePMC]
Purification and characterization of UDP-GlcNAc: GlcNAcbeta 1-6(GlcNAcbeta 1-2)Manalpha 1-R [GlcNAc to Man]-beta 1, 4-N-acetylglucosaminyltransferase VI from hen oviduct.

Taguchi T., Ogawa T., Inoue S., Inoue Y., Sakamoto Y., Korekane H., Taniguchi N.

A new beta1,4-N-acetylglucosaminyltransferase (GnT) responsible for the formation of branched N-linked complex-type sugar chains has been purified 64,000-fold in 16% yield from a homogenate of hen oviduct by column chromatography procedures using Q-Sepharose FF, Ni(2+)-chelating Sepharose FF, and ... >> More

A new beta1,4-N-acetylglucosaminyltransferase (GnT) responsible for the formation of branched N-linked complex-type sugar chains has been purified 64,000-fold in 16% yield from a homogenate of hen oviduct by column chromatography procedures using Q-Sepharose FF, Ni(2+)-chelating Sepharose FF, and UDP-hexanolamine-agarose. This enzyme catalyzes the transfer of GlcNAc from UDP-GlcNAc to tetraantennary oligosaccharide and produces pentaantennary oligosaccharide with the beta1-4-linked GlcNAc residue on the Manalpha1-6 arm. It requires a divalent cation such as Mn(2+) and has an apparent molecular weight of 72,000 under nonreducing conditions. The enzyme does not act on biantennary oligosaccharide (GnT I and II product), and beta1,6-N-acetylglucosaminylation of the Manalpha1-6 arm (GnT V product) is essential for its activity. This clearly distinguishes it from GnT IV, which is known to generate a beta1-4-linked GlcNAc residue only on the Manalpha1-3 arm. Based on these findings, we conclude that this enzyme is UDP-GlcNAc:GlcNAcbeta1-6(GlcNAcbeta1-2)Manalpha1-R [GlcNAc to Man]-beta1,4-N-acetylglucosaminyltransferase VI. This is the only known enzyme that has not been previously purified among GnTs responsible for antenna formation on the cores of N-linked complex-type sugar chains. << Less

J. Biol. Chem. 275:32598-32602(2000) [PubMed] [EuropePMC]

Enzymes

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Cross-references

Publications

Control of glycoprotein synthesis. Detection and characterization of a novel branching enzyme from hen oviduct, UDP-N-acetylglucosamine:GlcNAc beta 1-6 (GlcNAc beta 1-2)Man alpha-R (GlcNAc to Man) beta-4-N-acetylglucosaminyltransferase VI.

Molecular cloning and expression of cDNA encoding chicken UDP-N-acetyl-D-glucosamine (GlcNAc): GlcNAcbeta 1-6(GlcNAcbeta 1-2)-manalpha 1-R[GlcNAc to man]beta 1,4N-acetylglucosaminyltransferase VI.

Purification and characterization of UDP-GlcNAc: GlcNAcbeta 1-6(GlcNAcbeta 1-2)Manalpha 1-R [GlcNAc to Man]-beta 1, 4-N-acetylglucosaminyltransferase VI from hen oviduct.