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Related Experiment Videos

Ab initio electronic structure calculation of a new gene system using the negative factor counting method

J Li1, M Zaider, Y Zhao

  • 1Department of Radiation Oncology, College of Physicians & Surgeons of Columbia University, New York, New York 10032, USA.

Radiation Research
|May 20, 1998
PubMed
Summary

We calculated the electronic structure of the plasmid shuttle vector pCRR1 using ab initio Hartree-Fock methods. Frontier molecular orbitals are localized on bases, suggesting radiation-induced radicals primarily attack DNA bases.

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Area of Science:

  • Computational chemistry
  • Biophysics
  • Molecular biology

Background:

  • Plasmid shuttle vectors are crucial in genetic engineering and molecular biology.
  • Understanding the electronic structure of DNA is vital for predicting its reactivity.
  • Previous studies often simplified DNA structures, limiting detailed electronic analysis.

Purpose of the Study:

  • To compute the electronic structure (density of states and molecular orbitals) of the plasmid shuttle vector pCRR1.
  • To investigate the influence of solvation on the electronic properties of the DNA molecule.
  • To determine the localization of frontier molecular orbitals (HOMO and LUMO) within the plasmid structure.

Main Methods:

  • Utilized ab initio Hartree-Fock calculations for electronic structure determination.

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  • Implemented a vectorized negative factor counting (NFC) program to handle the biopolymer's aperiodicity.
  • Employed minimum and 6-31G basis sets, explicitly including solvation effects.

    • Main Results:

    • Solvation was found to have a negligible effect on the electronic structure of the plasmid.
    • Frontier molecular orbitals (highest occupied molecular orbital and lowest unoccupied molecular orbital) were observed to be highly localized on the DNA bases.
    • The vectorized NFC program enabled routine calculations for DNA molecules up to 100 deoxynucleotides.

    Conclusions:

    • The electronic structure calculations provide fundamental insights into the properties of plasmid DNA.
    • The localization of frontier orbitals on bases supports the hypothesis that radiation-induced radicals primarily interact with DNA bases.
    • This study demonstrates the capability of advanced computational methods for analyzing complex biopolymers like plasmids.