Information on EC 2.4.1.267 - dolichyl-P-Glc:Man9GlcNAc2-PP-dolichol alpha-1,3-glucosyltransferase

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The enzyme appears in viruses and cellular organisms

EC NUMBER
COMMENTARY hide
2.4.1.267
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RECOMMENDED NAME
GeneOntology No.
dolichyl-P-Glc:Man9GlcNAc2-PP-dolichol alpha-1,3-glucosyltransferase
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REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
dolichyl beta-D-glucosyl phosphate + D-Man-alpha-(1->2)-D-Man-alpha-(1->2)-D-Man-alpha-(1->3)-[D-Man-alpha-(1->2)-D-Man-alpha-(1->3)-[D-Man-alpha-(1->2)-D-Man-alpha-(1->6)]-D-Man-alpha-(1->6)]-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol = D-Glc-alpha-(1->3)-D-Man-alpha-(1->2)-D-Man-alpha-(1->2)-D-Man-alpha-(1->3)-[D-Man-alpha-(1->2)-D-Man-alpha-(1->3)-[D-Man-alpha-(1->2)-D-Man-alpha-(1->6)]-D-Man-alpha-(1->6)]-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolichol + dolichyl phosphate
show the reaction diagram
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PATHWAY
BRENDA Link
KEGG Link
MetaCyc Link
Metabolic pathways
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N-Glycan biosynthesis
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protein N-glycosylation (eukaryotic, high mannose)
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SYSTEMATIC NAME
IUBMB Comments
dolichyl beta-D-glucosyl phosphate: D-Man-alpha-(1->2)-D-Man-alpha-(1->2)-D-Man-alpha-(1->3)-[D-Man-alpha-(1->2)-D-Man-alpha-(1->3)-[D-Man-alpha-(1->2)-D-Man-alpha-(1->6)]-D-Man-alpha-(1->6)]-D-Man-beta-(1->4)-D-GlcNAc-beta-(1->4)-D-GlcNAc-diphosphodolich
The successive addition of three glucose residues by EC 2.4.1.267, EC 2.4.1.265 (Dol-P-Glc:Glc1Man9GlcNAc2-PP-Dol alpha-1,3-glucosyltransferase) and EC 2.4.1.256 (Dol-P-Glc:Glc2Man9GlcNAc2-PP-Dol alpha-1,2-glucosyltransferase) represents the final stage of the lipid-linked oligosaccharide assembly.
ORGANISM
COMMENTARY hide
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
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UniProt
Manually annotated by BRENDA team
GENERAL INFORMATION
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
malfunction
physiological function
SOURCE TISSUE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
SOURCE
Cloned/COMMENTARY
ORGANISM
UNIPROT
LITERATURE
expressed in the ALG6 deficient yeast strain
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ENGINEERING
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
A333V
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analysis of lipid-linked oligosaccharides in cultured fibroblasts indicates accumulation of Man9GlcNAc2-PP-Dol. Sequence analysis of ALG6 reveals a deletion of exon 3 (c.257 + 5G > A) in combination with a missense mutation (c.998C > T, p.Ala333Val). The patient shows skeletal dysplasia with brachytelephalangy
delI299/F304S
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patient with three mutations in the hALG6 gene. The maternal allele has an intronic G -> A mutation resulting in skipping of exon3 (IVS3 + 5G > A). This produces a nonfunctional enzyme as shown by its inability to restore normal glycosylation in a Saccharomyces cerevisiae strain lacking a functional ALG6. The paternal allele has two mutations. One is a deletion of three bases (895–897delATA) leading to an in-frame deletion of isoleucine 299 (delI299) located in a transmembrane domain. The second mutation on the same allele 911T > C causes a F304S change. When expressed in the ALG6 deficient yeast strain, this allele restores glycosylation but the mRNA is unstable or inefficiently transcribed, contributing to the impaired glycosylation in the patient
F304S
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natural variant, common polymorphism reduces the ability to rescue defective glycosylation of an alg6-deficient strain of S. cerevisiae during rapid growth, may exacerbate the clinical severity of patients with CDG1A
Y131H
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frequent natural variant, the cause of congenital disorder of glycosylation-Ic (CDG-Ic). One patient with typical CDG-Ic symptoms and a homozygous p.Tyr131His alteration in ALG6. In contrast to most CDG patients, her LLO and plasma transferrin glycosylation appeared normal. Thus, it is unclear whether Y131H causes CDG-Ic or contributes to the symptoms
APPLICATION
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
synthesis
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genetic engineering of N-glycan biosynthesis in Yarrowia lipolytica so that it produces Man(3)GlcNAc(2) structures on its glycoproteins. Disruption of the ALG3 gene, EC 2.4.1.258, results in modification of proteins mainly with Man(5)GlcNAc(2) and GlcMan(5)GlcNAc(2) glycans, and to a lesser extent with Glc(2)Man(5)GlcNAc(2) glycans. To avoid underoccupancy of glycosylation sites, Alg6, EC 2.4.1.267, is concomitantly overexpressed. Overexpression of the heterodimeric Aspergillus niger glucosidase II results in removal the terminal glucose residues. Overexpression of an alpha-1,2-mannosidase leads to Man(3)GlcNAc(2) structures, which are substrates for the synthesis of complex-type glycans. The final Yarrowia lipolytica strain produces proteins glycosylated with the trimannosyl core N-glycan (Man(3)GlcNAc(2)), which is the common core of all complex-type N-glycans