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DNA sequence-dependent deformability deduced from protein-DNA crystal complexes

W K Olson1, A A Gorin, X J Lu

  • 1Department of Chemistry, Rutgers University, New Brunswick, NJ 08903, USA. olson@rutchem.rutgers.edu

Proceedings of the National Academy of Sciences of the United States of America
|September 16, 1998
PubMed
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DNA deformability is crucial for cellular processes. New energy functions, derived from DNA-protein complexes, reveal sequence-dependent flexibility, highlighting pyrimidine-purine dimers as key hinges for molecular interactions.

Area of Science:

  • Structural Biology
  • Biophysics
  • Genomics

Background:

  • DNA deformability is essential for DNA packaging, molecular recognition, and transient opening in biological processes.
  • Understanding DNA's mechanical properties is key to deciphering its biological functions.

Purpose of the Study:

  • To develop sequence-dependent empirical energy functions for describing DNA deformability.
  • To analyze the role of local base step movements in DNA-protein interactions and deformations.

Main Methods:

  • Extraction of energy functions from fluctuations and correlations in DNA-protein crystal complex structures.
  • Analysis of both angular (bend, twist) and translational (shear, slide) parameters of DNA base steps.

Main Results:

Related Experiment Videos

  • Developed a complete set of sequence-dependent empirical energy functions for DNA elasticity.
  • Identified pyrimidine-purine dimers as highly variable "hinges" in DNA-protein complexes.
  • Correlations between base pair bending and shearing motions are significant for DNA folding in nucleoprotein complexes.

Conclusions:

  • The derived knowledge-based energies provide accurate stereochemical measures for DNA sequence recognition and protein-induced deformations.
  • These models offer realistic 3D representations for studying long DNA polymers, extending beyond traditional elastic rod models.
  • This work enhances the analysis of genomic sequences by incorporating detailed structural flexibility.