β-Glucose-1,6-Bisphosphate Stabilizes Pathological Phophomannomutase2 Mutants In Vitro and Represents a Lead Compound to Develop Pharmacological Chaperones for the Most Common Disorder of Glycosylation, PMM2-CDG

Int J Mol Sci. 2019 Aug 26;20(17):4164. doi: 10.3390/ijms20174164.

Abstract

A large number of mutations causing PMM2-CDG, which is the most frequent disorder of glycosylation, destabilize phosphomannomutase2. We looked for a pharmacological chaperone to cure PMM2-CDG, starting from the structure of a natural ligand of phosphomannomutase2, α-glucose-1,6-bisphosphate. The compound, β-glucose-1,6-bisphosphate, was synthesized and characterized via 31P-NMR. β-glucose-1,6-bisphosphate binds its target enzyme in silico. The binding induces a large conformational change that was predicted by the program PELE and validated in vitro by limited proteolysis. The ability of the compound to stabilize wild type phosphomannomutase2, as well as frequently encountered pathogenic mutants, was measured using thermal shift assay. β-glucose-1,6-bisphosphate is relatively resistant to the enzyme that specifically hydrolyses natural esose-bisphosphates.

Keywords: PMM2-CDG; glucose-1,6-bisphosphate; pharmacological chaperone.

MeSH terms

  • Congenital Disorders of Glycosylation / drug therapy
  • Congenital Disorders of Glycosylation / genetics*
  • Congenital Disorders of Glycosylation / metabolism*
  • Glucose-6-Phosphate / analogs & derivatives*
  • Glucose-6-Phosphate / chemistry
  • Glucose-6-Phosphate / metabolism
  • Glucose-6-Phosphate / pharmacology
  • Humans
  • Magnetic Resonance Spectroscopy
  • Models, Molecular
  • Molecular Conformation
  • Mutation*
  • Phosphotransferases (Phosphomutases) / deficiency*
  • Phosphotransferases (Phosphomutases) / genetics
  • Protein Binding

Substances

  • Glucose-6-Phosphate
  • glucose-1,6-bisphosphate
  • Phosphotransferases (Phosphomutases)

Supplementary concepts

  • Congenital disorder of glycosylation type 1A