6UIQ image
Entry Detail
PDB ID:
6UIQ
Keywords:
Title:
Crystal structure of wild-type human phosphoglucomutase 1 in complex with Glucose-6-Phosphate
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2019-10-01
Release Date:
2020-08-12
Method Details:
Experimental Method:
Resolution:
2.30 Å
R-Value Free:
0.22
R-Value Work:
0.16
R-Value Observed:
0.17
Space Group:
P 41 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:phosphoglucomutase-1
Chain IDs:A (auth: B), B (auth: A)
Chain Length:585
Number of Molecules:2
Biological Source:Homo sapiens
Primary Citation
A Hotspot for Disease-Associated Variants of Human PGM1 Is Associated with Impaired Ligand Binding and Loop Dynamics.
Structure 26 1337 1345.e3 (2018)
PMID: 30122451 DOI: 10.1016/j.str.2018.07.005

Abstact

Human phosphoglucomutase 1 (PGM1) plays a central role in cellular glucose homeostasis, catalyzing the conversion of glucose 1-phosphate and glucose 6-phosphate. Recently, missense variants of this enzyme were identified as causing an inborn error of metabolism, PGM1 deficiency, with features of a glycogen storage disease and a congenital disorder of glycosylation. Previous studies of selected PGM1 variants have revealed various mechanisms for enzyme dysfunction, including regions of structural disorder and side-chain rearrangements within the active site. Here, we examine variants within a substrate-binding loop in domain 4 (D4) of PGM1 that cause extreme impairment of activity. Biochemical, structural, and computational studies demonstrate multiple detrimental impacts resulting from these variants, including loss of conserved ligand-binding interactions and reduced mobility of the D4 loop, due to perturbation of its conformational ensemble. These potentially synergistic effects make this conserved ligand-binding loop a hotspot for disease-related variants in PGM1 and related enzymes.

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Primary Citation of related structures