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Updated: Jun 8, 2026
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X-Ray Crystallography to Study the Oligomeric State Transition of the Thermotoga maritima M42 Aminopeptidase TmPep1050
Published on: May 13, 2020
Human OGA binds substrates in a conserved peptide recognition groove.
Marianne Schimpl1, Alexander W Schüttelkopf, Vladimir S Borodkin
1University of Dundee, Scotland, UK.
The Biochemical Journal
|September 25, 2010
Summary
Researchers uncovered how O-GlcNAcase (OGA) recognizes its target proteins. This enzyme removes O-linked N-acetylglucosamine (O-GlcNAc) from proteins, impacting cellular processes and competing with phosphorylation.
Area of Science:
- Biochemistry
- Molecular Biology
- Cellular Biology
Background:
- O-GlcNAcylation, a post-translational modification, regulates numerous cellular processes by competing with protein phosphorylation.
- O-GlcNAcylation is dynamically regulated by O-GlcNAc transferase and O-GlcNAcase (OGA), but the substrate recognition mechanisms remain largely unknown.
Purpose of the Study:
- To elucidate the substrate recognition mechanism of human O-GlcNAcase (OGA).
- To investigate how OGA identifies and binds to its target proteins for O-GlcNAc removal.
Main Methods:
- Determined the crystal structure of a bacterial OGA orthologue to identify a conserved substrate-binding groove.
- Utilized site-directed mutagenesis on conserved amino acids within the putative binding groove of human OGA.
- Assessed the in vitro deglycosylation activity of mutated human OGA on substrate proteins TAB1, FoxO1, and CREB.
Main Results:
- The bacterial OGA structure revealed a conserved substrate-binding groove present in human OGA.
- Mutagenesis of conserved residues in the human OGA groove altered its deglycosylation activity.
- Evidence suggests human OGA interacts with O-GlcNAcylated proteins beyond the direct GlcNAc-binding site.
Conclusions:
- Human OGA likely employs a substrate recognition mechanism involving interactions beyond the catalytic site.
- This mechanism may allow for differential regulation of O-GlcNAc cycling on various cellular proteins.
- Findings provide the first insights into OGA's substrate specificity and recognition process.
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