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Conformational structure variations in DNA: a PCILO study

A Saran1, M R Choudhury

  • 1Chemical Physics Group, Tata Institute of Fundamental Research, Colaba, Bombay, India.

Indian Journal of Biochemistry & Biophysics
|February 1, 1993
PubMed
Summary
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The d(GpC) DNA unit is more stable than d(CpG), preferring a specific conformation linked to Z-II DNA stability. The d(CpG) unit shows a preference for a conformation resembling DNA-B structures.

Area of Science:

  • Computational chemistry
  • Molecular modeling
  • Biophysics

Background:

  • The Z-II DNA helix is a left-handed DNA conformation with distinct structural features.
  • Understanding the conformational preferences of dinucleotide units is crucial for explaining DNA stability and structural transitions.

Purpose of the Study:

  • To investigate the intrinsic conformational preferences of d(GpC) and d(CpG) dinucleotide units within the Z-II DNA context.
  • To determine the energetic stability and preferred torsion angles of these units using computational methods.

Main Methods:

  • Utilizing Perturbative Configuration Interaction using Localized Orbitals (PCILO) computations.
  • Fixing the sugar pucker to the crystallographic conformation of Z-II DNA.
  • Calculating PCILO energies as a function of key torsion angles (alpha and zeta) around phosphodiester bonds.

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Main Results:

  • The d(GpC) unit demonstrates greater energetic stability compared to the d(CpG) unit.
  • The d(GpC) unit favors a g+ t conformation in the (alpha-zeta) torsion angle space, consistent with observed crystal structures.
  • The d(CpG) unit exhibits an intrinsic preference for a g-g- conformation, with other torsion angles aligning with DNA-B structures.

Conclusions:

  • The d(GpC) unit's conformational preference may contribute significantly to the overall stability of the Z-II DNA helix.
  • The distinct conformational preferences of d(GpC) and d(CpG) units highlight their differential roles in DNA structure and dynamics.