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DNA polymorphism and local variation in base-pair orientation: a theoretical rationale.
Journal of Biomolecular Structure & Dynamics
|August 1, 1991
Summary
DNA basepair stacking calculations reveal sequence-dependent conformational preferences. While B-DNA structures are generally favored, stacking interactions alone do not explain the B-DNA to A-DNA transition in random sequences.
Area of Science:
- Structural Biology
- Computational Chemistry
- Biophysics
Background:
- DNA exhibits conformational polymorphism, crucial for its biological functions.
- Understanding sequence-dependent DNA structures is key to deciphering its regulatory mechanisms.
Purpose of the Study:
- To investigate the sequence dependence of DNA basepair stacking interactions.
- To analyze the conformational polymorphism of DNA using theoretical calculations.
Main Methods:
- Utilized a self-consistent parameter set for basepair stacking calculations.
- Modeled irregular DNA structures and basepair doublet geometries.
- Compared theoretical stacking energy minima with crystal structure data.
Main Results:
- Propeller modifications significantly enhance sequence-dependent stacking patterns.
- Most DNA sequences favor B-DNA-like geometries, with low energy contours aligning with crystal structures.
- A-DNA geometries are energetically unfavorable for purine-pyrimidine sequences but possible for others.
Conclusions:
- Theoretical stacking energy calculations align well with DNA crystal structure analyses.
- Basepair stacking interactions alone cannot fully explain the B-DNA to A-DNA transition in random DNA sequences.