Defective ALG14 does not transfer GlcNAc from UDP-GlcNAc to GlcNAcDOLP

Stable Identifier
Reaction [transition]
Homo sapiens
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UDP-N-acetylglucosamine transferase subunit ALG14 homolog (ALG14) forms a complex with ALG13 protein and is required for the addition of the second N-acetylglucosamine (GlcNAc) to the lipid linked oligosaccharide (LLO) intermediate (GlcNAcDOLDP) (Gao et al. 2005). Defects in ALG14 can cause congenital myasthenic syndrome (ALG14-CMS), which is due to a defect in neuromuscular signal transmission (Cossins et al. 2013). The most commonly affected muscles include proximal limb muscles. Mutations causing ALG14-CMS include p.P65L and p.R104* (Cossins et al. 2013).

Literature References
PubMed ID Title Journal Year
16100110 Alg14 recruits Alg13 to the cytoplasmic face of the endoplasmic reticulum to form a novel bipartite UDP-N-acetylglucosamine transferase required for the second step of N-linked glycosylation

Tachikawa, H, Gao, XD, Sato, T, Dean, N, Jigami, Y

J Biol Chem 2005
23404334 Congenital myasthenic syndromes due to mutations in ALG2 and ALG14

Seidhamed, MZ, Salih, MA, Cossins, J, Laval, S, Finlayson, S, Belaya, K, Carboni, N, Maxwell, S, Liu, WW, Zoltowska, K, Hicks, D, Farsani, GT

Brain 2013
Catalyst Activity

N-acetylglucosaminyldiphosphodolichol N-acetylglucosaminyltransferase activity of ALG13:ALG14 mutants [endoplasmic reticulum membrane]

Normal reaction
Functional status

Loss of function of ALG13:ALG14 mutants [endoplasmic reticulum membrane]

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