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Enzymes

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Name ^help_outline H₂O Identifier CHEBI:15377 (Beilstein: 3587155; CAS: 7732-18-5) ^help_outline Charge 0 Formula H2O InChIKey^help_outline XLYOFNOQVPJJNP-UHFFFAOYSA-N SMILES^help_outline [H]O[H] 2D coordinates Mol file for the small molecule Search links Involved in 6,048 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Name^help_outline N⁴-(α-D-Glc-(1→2)-α-D-Glc-(1→3)-α-D-Glc-(1→3)-α-D-Man-(1→2)-α-D-Man-(1→2)-α-D-Man-(1→3)-[α-D-Man-(1→2)-α-D-Man-(1→3)-[α-D-Man-(1→2)-α-D-Man-(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:12806 Reactive part ^help_outline
- Name ^help_outline N⁴-(α-D-Glc-(1→2)-α-D-Glc-(1→3)-α-D-Glc-(1→3)-α-D-Man-(1→2)-α-D-Man-(1→2)-α-D-Man-(1→3)-[α-D-Man-(1→2)-α-D-Man-(1→3)-[α-D-Man-(1→2)-α-D-Man-(1→6)]-α-D-Man-(1→6)]-β-D-Man-(1→4)-β-D-GlcNAc-(1→4)-β-D-GlcNAc)-L-asparaginyl residue Identifier CHEBI:132537 Charge 0 Formula C92H152N4O72 SMILES^help_outline N([C@@H]1O[C@@H]([C@H]([C@@H]([C@H]1NC(=O)C)O)O[C@H]2[C@@H]([C@H]([C@@H]([C@H](O2)CO)O[C@H]3[C@H]([C@H]([C@@H]([C@H](O3)CO[C@@H]4[C@H]([C@H]([C@@H]([C@H](O4)CO[C@@H]5[C@H]([C@H]([C@@H]([C@H](O5)CO)O)O)O[C@@H]6[C@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O)O)O[C@@H]7[C@H]([C@H]([C@@H]([C@H](O7)CO)O)O)O[C@@H]8[C@H]([C@H]([C@@H]([C@H](O8)CO)O)O)O)O)O)O[C@@H]9[C@H]([C@H]([C@@H]([C@H](O9)CO)O)O)O[C@@H]%10[C@H]([C@H]([C@@H]([C@H](O%10)CO)O)O)O[C@@H]%11[C@H]([C@H]([C@@H]([C@H](O%11)CO)O)O[C@@H]%12[C@@H]([C@H]([C@@H]([C@H](O%12)CO)O)O[C@@H]%13[C@@H]([C@H]([C@@H]([C@H](O%13)CO)O)O)O[C@@H]%14[C@@H]([C@H]([C@@H]([C@H](O%14)CO)O)O)O)O)O)O)O)NC(C)=O)CO)C(C[C@@H](C(*)=O)N*)=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
Search links Involved in 2 reaction(s) Find proteins in UniProtKB for this molecule
Name ^help_outline β-D-glucose Identifier CHEBI:15903 (Beilstein: 1281607; CAS: 492-61-5) ^help_outline Charge 0 Formula C6H12O6 InChIKey^help_outline WQZGKKKJIJFFOK-VFUOTHLCSA-N SMILES^help_outline OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 39 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Name^help_outline N⁴-(α-D-Glc-(1→3)-α-D-Glc-(1→3)-α-D-Man-(1→2)-α-D-Man-(1→2)-α-D-Man-(1→3)-[α-D-Man-(1→2)-α-D-Man-(1→3)-[α-D-Man-(1→2)-α-D-Man-(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:14355 Reactive part ^help_outline
- Name ^help_outline N⁴-(α-D-Glc-(1→3)-α-D-Glc-(1→3)-α-D-Man-(1→2)-α-D-Man-(1→2)-α-D-Man-(1→3)-[α-D-Man-(1→2)-α-D-Man-(1→3)-[α-D-Man-(1→2)-α-D-Man-(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:59082 Charge 0 Formula C86H142N4O67 SMILES^help_outline [C@@H]1([C@H]([C@H]([C@@H]([C@H](O1)CO[C@@H]2[C@H]([C@H]([C@@H]([C@H](O2)CO[C@@H]3[C@H]([C@H]([C@@H]([C@H](O3)CO)O)O)O[C@@H]4[C@H]([C@H]([C@@H]([C@H](O4)CO)O)O)O)O)O[C@@H]5[C@H]([C@H]([C@@H]([C@H](O5)CO)O)O)O[C@@H]6[C@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O)O)O)O[C@@H]7[C@H]([C@H]([C@@H]([C@H](O7)CO)O)O)O[C@@H]8[C@H]([C@H]([C@@H]([C@H](O8)CO)O)O)O[C@@H]9[C@H]([C@H]([C@@H]([C@H](O9)CO)O)O[C@@H]%10[C@@H]([C@H]([C@@H]([C@H](O%10)CO)O)O[C@@H]%11[C@@H]([C@H]([C@@H]([C@H](O%11)CO)O)O)O)O)O)O)O[C@H]%12[C@@H]([C@H]([C@@H](O[C@@H]%12CO)O[C@H]%13[C@@H]([C@H]([C@@H](O[C@@H]%13CO)NC(C[C@@H](C(=O)*)N*)=O)NC(=O)C)O)NC(=O)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
Search links Involved in 2 reaction(s) Find proteins in UniProtKB for this molecule

Cross-references

	RHEA:55988	RHEA:55989	RHEA:55990	RHEA:55991
Reaction direction	undefined	left-to-right	right-to-left	bidirectional
UniProtKB ^help_outline	4,857 proteins	3 proteins
EC numbers ^help_outline	3.2.1.106
Gene Ontology ^help_outline	GO:0004573
MetaCyc ^help_outline		3.2.1.106-RXN

Publications

Substrate specificities of rat liver microsomal glucosidases which process glycoproteins.

Grinna L.S., Robbins P.W.

The substrate specificities of rat liver microsomal glucosidases I and II, which hydrolyze oligosaccharides of the composition Glc3-1Man9GlcNAc, were investigated. Glucosidases I and II were shown to have a specific and necessary interaction with the 6'-pentamannosyl branch of their oligosaccharid ... >> More

The substrate specificities of rat liver microsomal glucosidases I and II, which hydrolyze oligosaccharides of the composition Glc3-1Man9GlcNAc, were investigated. Glucosidases I and II were shown to have a specific and necessary interaction with the 6'-pentamannosyl branch of their oligosaccharide substrates; activity was reduced when mannose residues were removed from this branch. Both glucosidases responded to features at the reducing end of the oligosaccharide substrates; activity was lower towards lipid-linked and peptide-linked substrates than towards free oligosaccharide substrates. In addition, the glucosidases appeared to discriminate between oligosaccharides linked to lipid and oligosaccharides linked to peptide. We conclude that rat liver microsomal glucosidases I and II interact with extensive portions of oligosaccharide structure in addition to the glucose residues which they hydrolyze. << Less

J Biol Chem 255:2255-2258(1980) [PubMed] [EuropePMC]
Partial purification from Saccharomyces cerevisiae of a soluble glucosidase which removes the terminal glucose from the oligosaccharide Glc3Man9GlcNAc2.

Kilker R.D. Jr., Saunier B., Tkacz J.S., Herscovics A.

Glucosidase activities capable of removing the three glucose residues from Glc3Man9GlcNAc2 oligosaccharide were detected in a cell-free preparation of Saccharomyces cerevisiae X-2180. The glucosidase which cleaves the glucose residue at the nonreducing terminus (Glc3Man9GlcNAc2 oligosaccharide glu ... >> More

Glucosidase activities capable of removing the three glucose residues from Glc3Man9GlcNAc2 oligosaccharide were detected in a cell-free preparation of Saccharomyces cerevisiae X-2180. The glucosidase which cleaves the glucose residue at the nonreducing terminus (Glc3Man9GlcNAc2 oligosaccharide glucosidase) was equally distributed between the particulate and the supernatant fractions obtained after centrifugation of the yeast homogenate at 27,000 X g for 30 min. The membrane-bound activity was stimulated by Triton X-100, whereas the supernatant activity was not affected. The soluble Glc3Man9GlcNAc2 oligosaccharide glucosidase was partially purified from the supernatant by ammonium sulfate fractionation followed by DEAE-Sephadex chromatography. It was clearly separated from alpha-glucosidase, which acts onp-nitrophenyl-alpha-D-glucopyranoside, but still contained beta-glucosidase and alpha-mannosidase acting on p-nitrophenyl-beta-D-glucopyranoside and alpha-D-mannopyranoside, respectively. The Glc3Man9GlcNAc2 oligosaccharide glucosidase had a pH optimum of 6.8, and showed no requirement for divalent cations. The enzyme was very active with glucose-labeled Glc3Man9GlcNAc2, was slightly active with Glc2Man9GlcNAc2, and showed no activity with Glc1Man9GlcNAc2. These properties suggest that this enzyme is involved in the first step of processing of oligosaccharides after transfer from dolichyl pyrophosphate to proteins. << Less

J Biol Chem 256:5299-5603(1981) [PubMed] [EuropePMC]
Partial purification and characterization of the glucosidases involved in the processing of asparagine-linked oligosaccharides.

Michael J.M., Kornfeld S.

Arch Biochem Biophys 199:249-258(1980) [PubMed] [EuropePMC]
Characterization of a glucosidase involved in an initial step in the processing of oligosaccharide chains.

Elting J.J., Chen W.W., Lennarz W.J.

J Biol Chem 255:2325-2331(1980) [PubMed] [EuropePMC]
Glycoprotein biosynthesis. Rat liver microsomal glucosidases which process oligosaccharides.

Grinna L.S., Robbins P.W.

Asparagine-linked oligosaccharides of glycoproteins undergo extensive modification or "processing" following their attachment to protein. A key step in post-glycosylation processing is the sequential removal of glucose residues from the protein-linked oligosaccharide. We have studied rat liver pre ... >> More

Asparagine-linked oligosaccharides of glycoproteins undergo extensive modification or "processing" following their attachment to protein. A key step in post-glycosylation processing is the sequential removal of glucose residues from the protein-linked oligosaccharide. We have studied rat liver preparations which catalyze removal of glucose from Glc3Man9GlcNAc, Glc2Man9GlcNAc, and Glc1Man9GlcNAc. Detergent solubilization studies, inhibitor studies, and temperature-activity profiles indicate that at least two distinct glucosidases are present in the membranes. One of these glucosidases removes the distal glucose from Glc3Man9GlcNAc, and the other glucosidase sequentially removes glucose from Glc2Man9GlcNAc and Glc1Man9GlcNAc. The latter glucosidase has been solubilized from the microsomal memrbranes and purified 12-fold. The glucosidases, which are integral membrane proteins, are localized in the rough and smooth microsomes and appear to be located on the cisternal surface of the microsomal vesicles. These glucosidases are suggested to be of biological importance in catalyzing the initial events in the post-glycosylation processing of cellular glycoprotein. << Less

J Biol Chem 254:8814-8818(1979) [PubMed] [EuropePMC]

Enzymes

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Cross-references

Publications

Substrate specificities of rat liver microsomal glucosidases which process glycoproteins.

Partial purification from Saccharomyces cerevisiae of a soluble glucosidase which removes the terminal glucose from the oligosaccharide Glc3Man9GlcNAc2.

Partial purification and characterization of the glucosidases involved in the processing of asparagine-linked oligosaccharides.

Characterization of a glucosidase involved in an initial step in the processing of oligosaccharide chains.

Glycoprotein biosynthesis. Rat liver microsomal glucosidases which process oligosaccharides.