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Arginine anchor points govern H3 tail dynamics.
Christine E Jennings1, Casey J Zoss2, Emma A Morrison1
1Department of Biochemistry, Medical College of Wisconsin, Milwaukee, WI, United States.
Frontiers in Molecular Biosciences
|June 1, 2023
Summary
Histone arginine residues are crucial for H3 tail dynamics in chromatin. Neutralizing these arginines increases H3 tail mobility, highlighting the role of post-translational modifications in regulating chromatin organization.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- Chromatin structure and dynamics are regulated by histone post-translational modifications (PTMs).
- Histone tails, particularly the H3 tail, interact dynamically with DNA within the nucleosome core particle.
- Arginine residues in histone tails are key sites for charge-modulating PTMs like citrullination, influencing DNA interactions.
Purpose of the Study:
- To investigate the contribution of arginine residues to the dynamics of the H3 tail within the nucleosome core particle.
- To understand how neutralizing arginine residues affects H3 tail dynamics and its implications for PTMs.
Main Methods:
- Nuclear Magnetic Resonance (NMR) nuclear spin relaxation experiments were employed.
- Arginine residues in the H3 tail were neutralized by mutation to glutamine.
Main Results:
- Neutralization of arginine residues led to increased regional mobility of the H3 tails.
- These findings suggest a direct impact of arginine PTMs on histone tail dynamics.
Conclusions:
- Histone tail dynamics play a significant role in the 'histone language' of gene regulation.
- Charge-modulating PTMs, such as arginine citrullination, are critical for regulating chromatin dynamics at the nucleosome level.
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