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Related Experiment Videos

Solution structure of the monoalkylated mitomycin C-DNA complex

M Sastry1, R Fiala, R Lipman

  • 1Department of Biochemistry and Molecular Biophysics, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA.

Journal of Molecular Biology
|March 24, 1995
PubMed
Summary

Mitomycin C (MC) is an antitumor drug that binds DNA. This study reveals the MC-DNA complex structure, showing MC in the minor groove and causing DNA conformational changes.

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Area of Science:

  • Structural Biology
  • Medicinal Chemistry

Background:

  • Mitomycin C (MC) is a potent antitumor antibiotic.
  • MC functions by alkylating DNA, forming covalent [MC]dG adducts.

Purpose of the Study:

  • To determine the solution structure of a monoalkylated MC-DNA 9-mer complex.
  • To elucidate the structural basis for MC-DNA interactions and sequence specificity.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Molecular dynamics (MD) simulations with NOE intensity-based refinement.

Main Results:

  • The [MC]dG adduct forms with retained Watson-Crick base pairing.
  • MC is positioned in the minor groove, angled relative to the helix axis.

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  • DNA conformational changes include base-pair displacement and altered stacking patterns, resembling A-DNA.

    • Conclusions:

    • The MC-DNA complex structure explains the sequence requirements for MC cross-linking and monoalkylation.
    • MC binding induces significant perturbations in DNA conformation.