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Related Experiment Videos

Flavones inhibit the hexameric replicative helicase RepA.

H Xu1, G Ziegelin, W Schröder

  • 1Institut für Kristallographie, Freie Universität Berlin, Takustrasse 6, D-14195 Berlin, Germany.

Nucleic Acids Research
|January 29, 2002
PubMed
Summary
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Flavone derivatives like dimyricetin inhibit DNA helicase RepA

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Helicases are crucial enzymes in DNA metabolism, facilitating nucleic acid unwinding.
  • Currently, heliquinomycin is the only known helicase inhibitor.
  • The RepA helicase from plasmid RSF1010, with a known structure, was used as a model.

Purpose of the Study:

  • To identify novel inhibitors of helicase activity.
  • To explore the potential of flavone derivatives as helicase inhibitors.
  • To investigate the mechanism of inhibition and potential pharmacological applications.

Main Methods:

  • Screening of commercially available flavone derivatives (luteolin, morin, myricetin, dimyricetin) against RepA helicase.
  • Assessing inhibition of ATPase and DNA unwinding activities.

Related Experiment Videos

  • Determining the mode of inhibition (non-competitive).
  • Testing the antibacterial activity of myricetin.

    • Main Results:

    • Luteolin, morin, myricetin, and dimyricetin inhibited RepA's ATPase and DNA unwinding activities.
    • Dimyricetin exhibited the strongest inhibitory effect.
    • All tested flavones non-competitively inhibited single-stranded DNA-dependent RepA ATPase activity.
    • Myricetin demonstrated antibacterial effects against both Gram-positive and Gram-negative bacteria.
    • Prokaryotic helicases showed differential sensitivity to myricetin.

    Conclusions:

    • Flavone derivatives are effective inhibitors of the RepA helicase.
    • Dimyricetin is a potent inhibitor of helicase activity.
    • Flavones offer potential scaffolds for designing new helicase inhibitors.
    • These compounds could aid in understanding helicase mechanisms and developing new drugs.