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Structural insights into polyisoprenyl-binding glycosyltransferases.

Allen P Zinkle1, Ryan T Morgan1, Rie Nygaard2

  • 1Department of Physiology and Cellular Biophysics, Columbia University Irving Medical Center, New York, NY 10032, USA.

Structure (London, England : 1993)
|January 30, 2025
PubMed
Summary

Glycosyltransferases (GTs) are key enzymes in building complex sugars. This study uses cryo-electron microscopy (cryo-EM) to reveal how these enzymes bind lipid carriers, offering insights into glycoconjugate biosynthesis.

Keywords:
enzymesglycosyltransferasemembrane protein structurepolyisoprenyl-phosphatepolyisoprenyl-pyrophosphate

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biology

Background:

  • Glycosyltransferases (GTs) synthesize essential glycoconjugates in all life forms.
  • Membrane-associated GTs utilize polyisoprenyl-phosphate (PP) lipid carriers for glycan transfer.
  • Understanding GT-ligand interactions is crucial for glycobiology.

Purpose of the Study:

  • To explore the structural diversity of PP-GTs.
  • To analyze the molecular mechanisms of PP ligand binding in GTs.
  • To identify shared and distinct PP coordination strategies among GT families.

Main Methods:

  • Single-particle cryo-electron microscopy (cryo-EM) was employed.
  • Analysis of liganded states of various PP-GTs.
  • Comparative structural analysis of PP-GT families.

Main Results:

  • Cryo-EM provides high-resolution structures of PP-GTs bound to lipid carriers.
  • Identified conserved and variable modes of PP ligand interaction.
  • Structural insights reveal how GTs accommodate diverse PP substrates.

Conclusions:

  • Structural studies illuminate the functional diversity of PP-GTs.
  • PP coordination mechanisms are key to GT substrate specificity and catalysis.
  • This work advances our understanding of glycoconjugate biosynthesis pathways.