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Structural Biology and Analytical Chemistry Approaches for Characterizing C-Glycoside Metabolic Enzymes in Human Gut Microbiota
Published on: May 23, 2025
975
[Structural Biological Approach to Biopharmaceuticals]
Koichi Kato1,2,3, Saeko Yanaka1,2,3, Hirokazu Yagi1
1Graduate School of Pharmaceutical Sciences, Nagoya City University.
Yakugaku Zasshi : Journal of the Pharmaceutical Society of Japan
|December 4, 2018
Summary
Glycosylation complicates protein biopharmaceutical characterization. We developed NMR and other methods to visualize dynamic glycoprotein structures and interactions, aiding biopharmaceutical development.
Area of Science:
- Structural biology
- Biochemistry
- Glycobiology
Background:
- Detailed structural characterization of protein biopharmaceuticals is crucial but challenging due to complex glycosylation.
- Oligosaccharides on glycoproteins influence their properties, function, pharmacokinetics, and pathogenicity.
Purpose of the Study:
- To develop a structural biology approach for characterizing dynamic 3D structures and interactions of glycoproteins.
- To investigate the structural impacts of varying glycoforms on the Fc region of immunoglobulin G (IgG).
Main Methods:
- Nuclear Magnetic Resonance (NMR) spectroscopy with metabolic stable-isotope labeling.
- X-ray crystallography.
- Integrative structural biology approaches including neutron scattering, atomic force microscopy, and molecular dynamics simulations.
Main Results:
- Elucidated structural mechanisms by which defucosylation of IgG-Fc enhances affinity for Fcγ receptor IIIa.
- Demonstrated improved antibody-dependent cell-mediated cytotoxicity due to defucosylation.
- Applied stable-isotope-assisted NMR to analyze biomolecular interactions in complex serum environments.
Conclusions:
- The developed NMR technique provides atomic-level probes for detecting structural perturbations in glycoproteins.
- An integrative structural biology approach offers new tools for visualizing dynamic glycoprotein structures and interactions.
- These insights are valuable for the development of novel biopharmaceuticals.
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