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New flavonoid derivatives combat bacterial antibiotic resistance. Buchwald-Hartwig amination created quercetin and luteolin compounds that suppress key resistance genes and efflux pumps in Staphylococcus aureus.

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Area of Science:

  • Medicinal Chemistry
  • Microbiology
  • Molecular Biology

Background:

  • Flavonoids like quercetin and luteolin are known to modulate bacterial resistance to antibiotics.
  • The precise molecular mechanisms underlying this modulation have not been fully elucidated.
  • Exploring novel flavonoid derivatives can lead to new strategies against multidrug-resistant bacteria.

Purpose of the Study:

  • To synthesize new quercetin and luteolin derivatives using Buchwald-Hartwig amination.
  • To investigate the impact of aniline moiety incorporation on the biological activities of these flavonoids.
  • To elucidate the molecular mechanisms by which these derivatives affect antibiotic resistance in Staphylococcus aureus.

Main Methods:

  • Buchwald-Hartwig amination was employed to synthesize novel flavonoid derivatives.
  • Biological activities including antioxidant, anti-inflammatory, and cytotoxicity were assessed.
  • The modulation of antibiotic resistance mechanisms, specifically erythromycin and gentamicin resistance in Staphylococcus aureus, was investigated at the molecular level.

Main Results:

  • The introduction of aniline moiety abolished anti-inflammatory activity but maintained low cytotoxicity.
  • Both quercetin and luteolin derivatives were found to attenuate erythromycin resistance by suppressing the ermA gene in Staphylococcus aureus.
  • 4-(trifluoromethyl)anilino quercetin demonstrated potent inhibition of ErmA, likely via interaction with its RNA-binding pocket.
  • 4-fluoroanilino derivatives effectively impeded the staphylococcal efflux system.
  • All synthesized derivatives showed enhanced activity in modulating gentamicin resistance compared to parent compounds.

Conclusions:

  • Incorporating substituted anilines into the flavonoid core significantly enhances their ability to combat multidrug resistance in bacteria.
  • The study provides the first report on the molecular mechanism of flavonoid-mediated antibiotic resistance modulation, focusing on ermA gene suppression and efflux pump inhibition.
  • These novel derivatives represent promising candidates for developing new agents against multidrug-resistant bacterial infections.