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Related Experiment Videos

DNA bending by asymmetric phosphate neutralization

J K Strauss1, L J Maher

  • 1Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha 68198-6805.

Science (New York, N.Y.)
|December 16, 1994
PubMed
Summary
This summary is machine-generated.

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Proteins with cationic surfaces bend DNA by neutralizing phosphates. This electrostatic neutralization creates an unbalanced force, deforming the DNA helix toward the protein surface.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • DNA bending is crucial for protein-DNA interactions.
  • The forces driving DNA bending by proteins are not fully understood.

Purpose of the Study:

  • To test the hypothesis that cationic protein surfaces induce DNA bending via phosphate neutralization.
  • To quantify the electrostatic contribution to DNA bending.

Main Methods:

  • Electrophoretic experiments were used to analyze DNA bending.
  • Neutral phosphate analogs were incorporated to modify DNA faces.
  • Phasing with an intrinsic DNA curvature site (hexadeoxyadenylate tract) was employed.

Main Results:

  • DNA spontaneously bent towards the neutralized face when modified with neutral phosphate analogs.

Related Experiment Videos

  • The electrostatic bend angle was estimated, confirming deformation towards the neutralized surface.
  • Results support the hypothesis of phosphate neutralization driving DNA bending.

    • Conclusions:

    • Phosphate neutralization by cationic protein surfaces is a significant mechanism for DNA bending.
    • Model systems involving phosphate neutralization can elucidate DNA bending by specific proteins.