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Insights into DNA solvation found in protein-DNA structures.

Wilma K Olson1, Yun Li1, Marcia O Fenley2

  • 1Department of Chemistry and Chemical Biology and Center for Quantitative Biology, Rutgers, the State University of New Jersey, Piscataway, New Jersey.

Biophysical Journal
|November 16, 2022
PubMed
Summary

Proteins interacting with DNA create a "binding cloud" of atoms, acting like an organized solvent. This atomic buildup influences DNA

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Area of Science:

  • Structural biology
  • Biochemistry
  • Molecular biology

Background:

  • Proteins binding to double-helical DNA create unique microenvironments.
  • High-resolution structures reveal interactions and conformational changes in protein-DNA complexes.

Purpose of the Study:

  • To analyze the atomic composition of the binding cloud formed by proteins around DNA.
  • To understand how this atomic buildup influences DNA structure and properties.

Main Methods:

  • Analysis of atomic buildup in various protein-DNA complexes.
  • Characterization of atom types and their distribution around DNA sugars, phosphates, and bases.

Main Results:

  • Proteins form a "binding cloud" around DNA through cumulative atom buildup.
  • Differences in atom composition within the cloud were observed.
  • Sequence-dependent features in the sugar-phosphate backbone microenvironment were identified.
  • A link between ionic species and DNA base electrostatic potentials was established.

Conclusions:

  • Viewing DNA-binding proteins as organized solvents offers new insights.
  • Findings can improve nucleic acid force fields and understanding of DNA in solution.