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Structural dynamics of a DNA-binding protein analyzed using diffracted X-ray tracking.

Yuhi Hosoe1, Hiroshi Sekiguchi2, Yuji C Sasaki3

  • 1Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, 1-5 Hangi-cho, Shimogamo, Sakyo-ku, Kyoto, Kyoto 606-8522, Japan.

Biophysical Chemistry
|August 20, 2021
PubMed
Summary
This summary is machine-generated.

Lowering protein density in Diffracted X-ray tracking (DXT) revealed two distinct dynamic populations for the DNA-binding protein c-Myb R2R3. This improved observation of protein structural dynamics, especially upon DNA binding.

Keywords:
DNA-binding protein, immobilization densityDiffracted X-ray trackingProtein structural dynamics

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Area of Science:

  • Biophysics
  • Structural Biology
  • Biochemistry

Background:

  • Diffracted X-ray tracking (DXT) analyzes protein dynamics using gold nanocrystals.
  • Gold nanocrystal size relative to protein can be a technical challenge.
  • Previous DXT studies showed limited dynamic populations for c-Myb R2R3.

Purpose of the Study:

  • Re-evaluate c-Myb R2R3 dynamics using DXT with optimized protein immobilization.
  • To investigate if lower protein density improves the observation of protein structural dynamics.
  • To understand the influence of DNA binding on c-Myb R2R3 dynamics.

Main Methods:

  • Utilized Diffracted X-ray tracking (DXT) for real-time protein motion analysis.
  • Immobilized the DNA-binding protein c-Myb R2R3 at a low density on the DXT substrate.
  • Analyzed mean square angular displacement curves to characterize protein dynamics.

Main Results:

  • Observed two distinct dynamical moving populations for DNA-bound c-Myb R2R3.
  • These populations are attributed to electrostatic interactions (attraction/repulsion) within DNA-protein complexes.
  • Lowering protein immobilization density enhanced the observation of protein movement.

Conclusions:

  • Reduced protein density in DXT allows for more comprehensive observation of protein structural dynamics.
  • DXT can resolve complex dynamics in DNA-binding proteins like c-Myb R2R3.
  • Electrostatic forces play a significant role in the observed dynamics of DNA-protein complexes.