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Identifying Inhibitors of the HBx-DDB1 Interaction Using a Split Luciferase Assay System
Published on: December 21, 2019
HDAC3 is negatively regulated by the nuclear protein DBC1
Claudia C S Chini1, Carlos Escande, Veronica Nin
1Laboratory of Signal Transduction, Department of Anesthesiology, Mayo Clinic College of Medicine, Rochester, Minnesota 55905, USA.
The Journal of Biological Chemistry
|October 30, 2010
Summary
The nuclear protein DBC1 inhibits histone deacetylase 3 (HDAC3) activity, acting as a negative regulator. This discovery reveals DBC1
Area of Science:
- Molecular Biology
- Epigenetics
- Biochemistry
Background:
- Histone deacetylase 3 (HDAC3) is a Class I histone deacetylase involved in gene expression.
- HDAC3 activity is modulated by co-repressors like NCoR and SMRT.
- DBC1 is a known regulator of nuclear receptors, SUV39H1, and SIRT1, with roles in transcription and apoptosis.
Purpose of the Study:
- To investigate the interaction between DBC1 and HDAC3.
- To determine if DBC1 regulates HDAC3 activity and localization.
- To identify DBC1 as a novel inhibitor of HDAC3.
Main Methods:
- Co-immunoprecipitation to assess protein interactions.
- Enzyme activity assays to measure deacetylase function.
- Cellular expression and knockdown/knock-out studies in mammalian cells and mouse tissues.
Main Results:
- DBC1 directly interacts with and specifically inhibits HDAC3 deacetylase activity.
- The N-terminus of DBC1 and C-terminus of HDAC3 are crucial for this interaction.
- DBC1 expression alters HDAC3 subcellular distribution.
- Knockdown or knock-out of DBC1 leads to increased HDAC3 activity.
Conclusions:
- DBC1 is identified as an endogenous inhibitor of HDAC3.
- DBC1 negatively regulates both SIRT1 and HDAC3, two distinct deacetylases.
- These findings enhance understanding of DBC1 and HDAC3 roles in metabolic diseases and cancer.
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