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Changes in conformational dynamics of basic side chains upon protein-DNA association.

Alexandre Esadze1, Chuanying Chen1, Levani Zandarashvili1

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Protein-DNA interactions involve dynamic basic side chains. Arginine side chains binding DNA bases become rigid, while those binding phosphates remain mobile, showing distinct dynamics and entropy changes.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biophysics

Background:

  • Basic side chains are crucial for protein-nucleic acid recognition.
  • The dynamic properties of these charged side chains during binding are not fully understood.

Purpose of the Study:

  • To investigate the conformational dynamics of basic side chains in the zinc-finger protein Egr-1 upon DNA association.
  • To compare the dynamics and entropic changes of arginine and lysine side chains interacting with DNA.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy to characterize side-chain dynamics.
  • Molecular Dynamics (MD) simulations to analyze conformational entropy and dynamics.

Main Results:

  • Arginine guanidino groups interacting with DNA bases showed strong immobilization, forming rigid interfaces.
  • Most basic side chains interacting with DNA phosphates maintained high mobility, forming dynamic interfaces.
  • Lysine side chains exhibited minor changes in dynamics and conformational entropy upon DNA binding, unlike arginine.

Conclusions:

  • Arginine and lysine side chains display distinct dynamic behaviors and entropic contributions upon protein-DNA complex formation.
  • These findings highlight the differential roles of basic amino acids in mediating protein-nucleic acid interactions.