5O9X image
Entry Detail
PDB ID:
5O9X
Keywords:
Title:
Crystal structure of Aspergillus fumigatus N-acetylphosphoglucosamine mutate S69A in complex with glucose1,6bisphosphate
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2017-06-20
Release Date:
2018-07-11
Method Details:
Experimental Method:
Resolution:
1.90 Å
R-Value Free:
0.20
R-Value Work:
0.16
R-Value Observed:
0.16
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Phosphoacetylglucosamine mutase
Mutations:S69A
Chain IDs:A
Chain Length:549
Number of Molecules:1
Biological Source:Aspergillus lentulus
Primary Citation
Evidence for substrate-assisted catalysis inN-acetylphosphoglucosamine mutase.
Biochem. J. 475 2547 2557 (2018)
PMID: 29967067 DOI: 10.1042/BCJ20180172

Abstact

N-acetylphosphoglucosamine mutase (AGM1) is a key component of the hexosamine biosynthetic pathway that produces UDP-GlcNAc, an essential precursor for a wide range of glycans in eukaryotes. AGM belongs to the α-d-phosphohexomutase metalloenzyme superfamily and catalyzes the interconversion of N-acetylglucosamine-6-phosphate (GlcNAc-6P) to N-acetylglucosamine-1-phosphate (GlcNAc-1P) through N-acetylglucosamine-1,6-bisphosphate (GlcNAc-1,6-bisP) as the catalytic intermediate. Although there is an understanding of the phosphoserine-dependent catalytic mechanism at enzymatic and structural level, the identity of the requisite catalytic base in AGM1/phosphoglucomutases is as yet unknown. Here, we present crystal structures of a Michaelis complex of AGM1 with GlcNAc-6P and Mg2+, and a complex of the inactive Ser69Ala mutant together with glucose-1,6-bisphosphate (Glc-1,6-bisP) that represents key snapshots along the reaction co-ordinate. Together with mutagenesis, these structures reveal that the phosphate group of the hexose-1,6-bisP intermediate may act as the catalytic base.

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Primary Citation of related structures