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Deoxyribonucleic acid, or DNA, is the genetic material responsible for passing traits from generation to generation in all organisms and most viruses. DNA is composed of two strands of nucleotides that wind around each other to form a spring-like structure called a double helix. However, the double helix is not perfectly symmetrical. Instead, there are regularly occurring grooves in the structure. The major groove occurs where the sugar-phosphate backbones are relatively far apart. This space...
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Variability of the DNA Backbone Geometry in DNA-Protein Complexes: Experimental Data Analysis.

Ivan A Strelnikov1, Natalya A Kovaleva1, Elena A Zubova1

  • 1N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 4 Kosygin Street, Moscow 119991, Russia.

Journal of Chemical Information and Modeling
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DNA backbone flexibility varies across states, with sugar-phosphate (α/γ) mobility increasing from crystals to solutions and protein complexes. Key angles remain orthogonal, and proteins alter DNA shape without changing deoxyribose conformation.

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Area of Science:

  • Structural Biology
  • Biophysics
  • Molecular Biology

Background:

  • DNA backbone geometry is crucial for its function and is studied in various states: solution (NMR), crystals (X-ray), and protein complexes (X-ray, cryo-EM).
  • Understanding DNA flexibility and conformational changes is key to deciphering its interactions with proteins.

Purpose of the Study:

  • To analyze and compare experimental data on DNA backbone geometry across different states.
  • To investigate the orthogonality of major degrees of freedom in the DNA sugar-phosphate backbone.
  • To identify how DNA-protein interactions influence DNA local shape and geometry.

Main Methods:

  • Analysis of publicly available experimental data from the Protein Data Bank (PDB).
  • Comparison of DNA backbone geometry (deoxyribose and phosphate angles) in solution, crystals, and protein complexes.
  • Statistical analysis of geometric parameters and their correlations.

Main Results:

  • Deoxyribose (τ₀) and phosphate (ε/ζ) flexibilities are similar across all analyzed states.
  • Sugar-phosphate (α/γ) mobility increases from crystalline DNA to DNA in solution and DNA-protein complexes.
  • The three main degrees of freedom of the DNA backbone (τ₀, (ζ-ε), and (γ-α)) are largely orthogonal.
  • DNA-protein complexes often exhibit local helical shapes resembling A-DNA without altering deoxyribose conformation.
  • Specific nucleotide angles (C3'C1'N* and C4'C3'P(2)) correlate with τ₀ and (ζ-ε), respectively, and are orthogonal in complexes.
  • X-ray and cryo-EM data for DNA-protein complexes largely agree, with notable differences in τ₀ histograms.

Conclusions:

  • DNA backbone mobility is state-dependent, particularly for the sugar-phosphate backbone.
  • The orthogonality of key backbone angles is maintained even in DNA-protein complexes.
  • Proteins can induce local conformational changes in DNA geometry without fundamentally altering deoxyribose conformation.
  • New local geometric parameters correlate with backbone angles and offer insights into DNA structure in complexes.