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Diverse nucleosome Site-Selectivity among histone deacetylase complexes
Zhipeng A Wang1,2, Christopher J Millard3, Chia-Liang Lin3
1Division of Genetics, Department of Medicine, Brigham and Women's Hospital, Boston, United States.
Elife
|June 6, 2020
Summary
Histone deacetylase (HDAC) complexes exhibit varied activity and site-selectivity on acetylated nucleosomes. Specific residues, like Gly13 in histone H3, significantly impact HDAC complex deacetylase function.
Area of Science:
- Biochemistry
- Molecular Biology
- Epigenetics
Background:
- Histone acetylation regulates gene expression by altering chromatin structure.
- Histone deacetylases (HDACs) remove acetyl groups, influencing cellular functions.
- The impact of multi-subunit HDAC complexes on deacetylase activity and site-selectivity remains unclear.
Purpose of the Study:
- To investigate the enzymatic properties of five class I HDAC complexes.
- To analyze the site-selectivity of these complexes on specific acetylated nucleosome substrates.
- To understand how complex composition influences HDAC activity.
Main Methods:
- Enzymatic assays using site-specifically acetylated nucleosome substrates.
- Analysis of five class I HDAC complexes: CoREST, NuRD, Sin3B, MiDAC, and SMRT.
- Characterization of deacetylase rates and substrate preferences.
Main Results:
- HDAC complexes display diverse deacetylase rates and site-selectivity.
- The CoREST complex shows a preference for H3K9ac over H3K14ac.
- Histone H3 Gly13 residue significantly reduces CoREST complex activity on H3K14ac.
Conclusions:
- HDAC complex composition dictates enzymatic activity and substrate specificity.
- Specific histone residues play a crucial role in modulating HDAC function.
- These findings provide a basis for linking HDAC enzymatic activity to biological roles.
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