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Distinct OGT-Binding Sites Promote HCF-1 Cleavage
Tanja Bhuiyan1, Patrice Waridel2, Vaibhav Kapuria1
1Center for Integrative Genomics, University of Lausanne, Génopode, Lausanne, Switzerland.
Plos One
|August 26, 2015
Summary
Human HCF-1 (HCFC-1) maturation involves O-GlcNAcylation and proteolysis by O-GlcNAc transferase (OGT). OGT
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Human HCF-1 (HCFC-1) is a key transcriptional co-regulator.
- HCF-1 undergoes O-GlcNAcylation and proteolysis for maturation.
- These processes are catalyzed by O-GlcNAc transferase (OGT).
Purpose of the Study:
- To characterize substrate requirements for OGT cleavage of HCF-1.
- To elucidate the mechanism of OGT's dual enzymatic activity.
- To identify novel OGT-binding sequences within HCF-1.
Main Methods:
- Biochemical assays to study OGT-HCF-1 interactions.
- Site-directed mutagenesis to probe specific residues.
- Analysis of OGT binding affinities and cleavage efficiency.
Main Results:
- HCF-1 proteolysis occurs at conserved HCF-1PRO repeats.
- Specific glutamate residues at cleavage sites inhibit OGT association.
- A novel OGT-binding sequence enhances HCF-1 cleavage.
Conclusions:
- Distinct OGT-binding sites regulate HCF-1 proteolysis.
- Understanding these sites provides insight into OGT's unusual protease activity.
- This work sheds light on HCF-1 maturation and cell-division cycle regulation.
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