8FE7 image
Entry Detail
PDB ID:
8FE7
Keywords:
Title:
Crystal structure of human O-GlcNAc transferase (OGT) in complex with an exosite-binding peptide (SMG9) and UDP-GlcNAc
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2022-12-05
Release Date:
2023-08-09
Method Details:
Experimental Method:
Resolution:
2.98 Å
R-Value Free:
0.21
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
P 3 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:UDP-N-acetylglucosamine--peptide N-acetylglucosaminyltransferase 110 kDa subunit
Chain IDs:A, C, E, G
Chain Length:723
Number of Molecules:4
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Nonsense-mediated mRNA decay factor SMG9
Chain IDs:B, D, F, H
Chain Length:12
Number of Molecules:4
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Motif-dependent binding on the intervening domain regulates O-GlcNAc transferase.
Nat.Chem.Biol. 19 1423 1431 (2023)
PMID: 37653170 DOI: 10.1038/s41589-023-01422-2

Abstact

The modification of intracellular proteins with O-linked β-N-acetylglucosamine (O-GlcNAc) moieties is a highly dynamic process that spatiotemporally regulates nearly every important cellular program. Despite its significance, little is known about the substrate recognition and regulation modes of O-GlcNAc transferase (OGT), the primary enzyme responsible for O-GlcNAc addition. In this study, we identified the intervening domain (Int-D), a poorly understood protein fold found only in metazoan OGTs, as a specific regulator of OGT protein-protein interactions and substrate modification. Using proteomic peptide phage display (ProP-PD) coupled with structural, biochemical and cellular characterizations, we discovered a strongly enriched peptide motif, employed by the Int-D to facilitate specific O-GlcNAcylation. We further show that disruption of Int-D binding dysregulates important cellular programs, including response to nutrient deprivation and glucose metabolism. These findings illustrate a mode of OGT substrate recognition and offer key insights into the biological roles of this unique domain.

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