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Structural and functional insight into human O-GlcNAcase.

Christian Roth¹, Sherry Chan¹, Wendy A Offen¹

¹York Structural Biology Laboratory, Department of Chemistry University of York, York, UK.

Nature Chemical Biology

|March 28, 2017

Summary

This summary is machine-generated.

O-linked N-acetylglucosamine (O-GlcNAc) hydrolase (OGA) is crucial for protein regulation. Researchers elucidated the human OGA structure, revealing a unique dimer, aiding in understanding its function and designing new therapeutic inhibitors.

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Identification and Characterization of Protein Glycosylation using Specific Endo- and Exoglycosidases

Identification and Characterization of Protein Glycosylation using Specific Endo- and Exoglycosidases

Published on: December 26, 2011

Area of Science:

Biochemistry and structural biology
Enzymology
Glycoscience

Background:

O-linked N-acetylglucosamine (O-GlcNAc) is a dynamic post-translational modification found on numerous nucleocytoplasmic proteins.
O-GlcNAc hydrolase (OGA) is the primary enzyme responsible for removing O-GlcNAc modifications, playing a critical role in cellular signaling and homeostasis.
Dysregulation of O-GlcNAc cycling is implicated in various diseases, including cancer, diabetes, and neurodegenerative disorders, highlighting OGA as a potential therapeutic target.

Purpose of the Study:

To determine the three-dimensional structure of human O-GlcNAc hydrolase (OGA).
To understand the structural basis of OGA's unusual helix-exchanged dimeric assembly.
To provide a structural foundation for understanding OGA substrate recognition and regulation, and for designing novel inhibitors.

Main Methods:

Co-expression and assembly of OGA fragments.
X-ray crystallography to determine the high-resolution three-dimensional structure of human OGA.
Structural analysis of OGA in complex with various inhibitors.

Main Results:

The study determined the first three-dimensional structure of human OGA.
OGA forms an unusual helix-exchanged dimer, providing insights into its quaternary structure.
Structures of OGA complexed with inhibitors reveal key binding interactions and inform inhibitor design.

Conclusions:

The determined structure of the O-GlcNAc hydrolase (OGA) provides unprecedented structural insights into its function.
The unusual dimeric structure of OGA is a key feature for its activity and regulation.
Structural information from OGA-inhibitor complexes offers a blueprint for developing clinically valuable OGA inhibitors for therapeutic intervention.