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Non-histone binding functions of PHD fingers
Nitika Gaurav1, Tatiana G Kutateladze1
1Department of Pharmacology, University of Colorado School of Medicine, Aurora, CO 80045, USA.
Trends in Biochemical Sciences
|April 15, 2023
Summary
Plant homeodomain (PHD) fingers are epigenetic readers that typically bind histone H3. Recent studies reveal some PHD fingers also interact with non-histone proteins and DNA, expanding their known functions.
Area of Science:
- Molecular Biology
- Epigenetics
- Protein-protein interactions
Background:
- Plant homeodomain (PHD) fingers are a significant class of epigenetic readers.
- Traditionally, PHD fingers are known to bind the histone H3 amino-terminal tail.
- This interaction is specific and can be modulated by histone modifications and other protein domains.
Purpose of the Study:
- To review the molecular mechanisms of PHD finger interactions with non-histone ligands.
- To explore the binding of PHD fingers to H3 mimetics and DNA.
- To compare and contrast interactions with histone versus non-histone partners.
Main Methods:
- Literature review of recent studies on PHD finger interactions.
- Analysis of structural and biochemical data on PHD finger binding.
- Comparative analysis of binding mechanisms.
Main Results:
- A subset of PHD fingers interacts with non-histone proteins, H3 mimetics, and DNA.
- These interactions involve distinct molecular mechanisms compared to canonical H3 binding.
- Post-translational modifications can influence binding specificity.
Conclusions:
- PHD fingers exhibit a broader ligand-binding capability than previously recognized.
- Understanding these alternative interactions is crucial for comprehending epigenetic regulation.
- This expands the functional repertoire of PHD fingers in cellular processes.
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