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Inhibition of reverse transcriptases by flavonoids.

G Spedding1, A Ratty, E Middleton

  • 1Department of Medicine, State University of New York, Buffalo General Hospital 14203.

Antiviral Research
|September 1, 1989
PubMed
Summary

Naturally occurring flavonoids inhibit key enzymes like avian myeloblastosis (AMV) RT, Rous-associated virus-2 (RAV-2) RT, and Maloney murine leukemia virus (MMLV) RT. Amentoflavone, scutellarein, and quercetin show significant concentration-dependent inhibitory effects.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Reverse transcriptases (RTs) are crucial enzymes in retroviral replication and are targets for antiviral therapies.
  • Flavonoids are a diverse group of plant-derived compounds with a wide range of biological activities.
  • The potential inhibitory effects of natural flavonoids on RT activity remain an area of interest for drug discovery.

Purpose of the Study:

  • To investigate the inhibitory potential of selected naturally occurring flavonoids against avian myeloblastosis (AMV) RT, Rous-associated virus-2 (RAV-2) RT, and Maloney murine leukemia virus (MMLV) RT.
  • To identify the most potent flavonoid inhibitors and characterize their concentration-dependent effects.
  • To explore the mechanism of action of potent flavonoid inhibitors on RT activity.

Main Methods:

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  • Enzyme inhibition assays were performed using AMV RT, RAV-2 RT, and MMLV RT with specified template-primer combinations (poly (rA)oligo(dT)12-18 or rabbit globin mRNA).
  • The effects of various naturally occurring flavonoids were tested, focusing on concentration-dependent inhibition.
  • Kinetic studies were conducted for selected flavonoids to elucidate their mechanism of action.

Main Results:

  • Several naturally occurring flavonoids demonstrated inhibitory activity against the tested RT enzymes.
  • Amentoflavone, scutellarein, and quercetin emerged as the most potent inhibitors, exhibiting concentration-dependent effects.
  • Differential sensitivity of the RT enzymes to flavonoid inhibition was observed. Amentoflavone and scutellarein were shown to inhibit ongoing DNA synthesis catalyzed by MMLV RT and RAV-2 RT, respectively.

Conclusions:

  • Naturally occurring flavonoids, particularly amentoflavone, scutellarein, and quercetin, possess significant inhibitory activity against multiple reverse transcriptases.
  • These flavonoids represent potential lead compounds for the development of novel antiviral agents targeting RT.
  • Further kinetic studies suggest specific mechanisms by which these flavonoids interfere with RT function.