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Molecular dynamics simulations on parallel and antiparallel C.G*G triplexes.

M R Kiran1, M Bansal

  • 1Molecular Biophysics Unit, Indian Institute of Science, Bangalore.

Journal of Biomolecular Structure & Dynamics
|March 3, 1999
PubMed
Summary
This summary is machine-generated.

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Molecular dynamics simulations reveal that both parallel and antiparallel C.G*G triplexes are energetically favorable. The parallel structure shows greater stability, while the antiparallel structure can distort but remains comparable in energy.

Area of Science:

  • Structural biology
  • Computational chemistry
  • Biophysics

Background:

  • Hoogsteen hydrogen bonded C.G*G triplexes exist in parallel and antiparallel forms.
  • Previous molecular mechanics studies suggested the parallel structure is more energetically favorable than the antiparallel structure.

Purpose of the Study:

  • To characterize the structural stability of parallel and antiparallel C.G*G triplexes using molecular dynamics (MD).
  • To investigate if the antiparallel structure can transition to a more stable conformation due to local fluctuations during MD simulations.

Main Methods:

  • 200 ps constant temperature vacuum MD simulations at 300K were performed on both parallel and antiparallel C.G*G triplexes without initial constraints.
  • A second MD simulation was conducted on the antiparallel triplex with constrained hydrogen bonds to analyze undistorted structures.

Related Experiment Videos

  • Energy minimization studies with explicit water and counterions were also performed.

    • Main Results:

    • The antiparallel triplex showed significant root mean square deviation and hydrogen bond distortion within 12 ps, with increased propeller twist and basepair opening.
    • The average helical twist stabilized at 36 degrees for the unconstrained antiparallel structure, compared to 33 degrees for the parallel structure.
    • Even with distortions, the antiparallel triplex was energetically comparable to the parallel triplex; constraining hydrogen bonds in the antiparallel structure resulted in a 33-degree twist but did not improve its energy to match the parallel structure.

    Conclusions:

    • Both parallel and antiparallel C.G*G triplexes with Hoogsteen hydrogen bonds are stereochemically and energetically favorable.
    • The parallel C.G*G triplex demonstrates greater structural stability under simulation conditions.
    • MD simulations provide insights into the dynamic behavior and relative stability of different nucleic acid triplex conformations.