The Enzyme Database

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EC 2.4.1.229     
Accepted name: [Skp1-protein]-hydroxyproline N-acetylglucosaminyltransferase
Reaction: UDP-N-acetyl-α-D-glucosamine + [Skp1-protein]-trans-4-hydroxy-L-proline = UDP + [Skp1-protein]-O-(N-acetyl-α-D-glucosaminyl)-trans-4-hydroxy-L-proline
Other name(s): Skp1-HyPro GlcNAc-transferase; UDP-N-acetylglucosamine (GlcNAc):hydroxyproline polypeptide GlcNAc-transferase; UDP-GlcNAc:Skp1-hydroxyproline GlcNAc-transferase; UDP-GlcNAc:hydroxyproline polypeptide GlcNAc-transferase; UDP-N-acetyl-D-glucosamine:[Skp1-protein]-hydroxyproline N-acetyl-D-glucosaminyl-transferase
Systematic name: UDP-N-acetyl-α-D-glucosamine:[Skp1-protein]-trans-4-hydroxy-L-proline N-acetyl-α-D-glucosaminyl-transferase
Comments: Skp1 is a cytoplasmic and nuclear protein required for the ubiquitination of cell cycle regulatory proteins and transcriptional factors. In Dictyostelium Skp1 is modified by the linear pentasaccharide Galα1-6Galα1-L-Fucα1-2Galβ1-3GlcNAc, which is attached to a hydroxyproline residue at position 143. This enzyme catalyses the first step in the building up of the pentasaccharide by attaching an N-acetylglucosaminyl group to the hydroxyproline residue. It requires dithiothreitol and a divalent cation for activity.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number: 256531-81-4
References:
1.  van der Wel, H., Morris, H.R., Panico, M., Paxton, T., Dell, A., Kaplan, L. and West, C.M. Molecular cloning and expression of a UDP-N-acetylglucosamine (GlcNAc):hydroxyproline polypeptide GlcNAc-transferase that modifies Skp1 in the cytoplasm of Dictyostelium. J. Biol. Chem. 277 (2002) 46328–46337. [PMID: 12244115]
2.  Teng-umnuay, P., van der Wel, H. and West, C.M. Identification of a UDP-GlcNAc:Skp1-hydroxyproline GlcNAc-transferase in the cytoplasm of Dictyostelium. J. Biol. Chem. 274 (1999) 36392–36402. [PMID: 10593934]
3.  West, C.M., van der Wel, H. and Gaucher, E.A. Complex glycosylation of Skp1 in Dictyostelium: implications for the modification of other eukaryotic cytoplasmic and nuclear proteins. Glycobiology 12 (2002) 17. [PMID: 11886837]
[EC 2.4.1.229 created 2003, modified 2013]
 
 


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