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Related Experiment Videos

Michellamine alkaloids inhibit protein kinase C.

E L White1, W R Chao, L J Ross

  • 1Department of Biochemistry, Southern Research Institute, Birmingham, Alabama 35205, USA. white@sri.org

Archives of Biochemistry and Biophysics
|May 1, 1999
PubMed
Summary

Michellamines A, B, and C show antiviral effects by inhibiting HIV reverse transcriptase, cellular fusion, and protein kinase C (PKC). These compounds bind to the PKC kinase domain, suggesting a new therapeutic avenue.

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Area of Science:

  • Virology
  • Biochemistry
  • Pharmacology

Background:

  • Michellamines A, B, and C exhibit antiviral activity against HIV-1 and HIV-2 in cell cultures.
  • Known antiviral mechanisms include inhibition of HIV reverse transcriptase and HIV-induced cellular fusion.
  • Structural similarity to protein kinase C (PKC) inhibitors suggests a potential role for PKC inhibition.

Purpose of the Study:

  • To investigate the potential of michellamines as inhibitors of protein kinase C (PKC).
  • To elucidate the mechanism of PKC inhibition by michellamines.

Main Methods:

  • Enzyme inhibition assays were performed using rat brain PKC.
  • Kinetic analysis determined inhibition types and constants (IC50, Ki) for michellamine B.
  • Molecular modeling was employed to visualize michellamine binding to the PKC kinase domain.

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Main Results:

  • Michellamines inhibited rat brain PKC with IC50 values ranging from 15-35 microM.
  • Michellamine B acted as a noncompetitive inhibitor concerning ATP (Ki: 4-6 microM) and a mixed-type inhibitor concerning the peptide substrate.
  • Molecular modeling indicated that michellamines bind within the active site cleft of the PKC kinase domain, blocking ATP and peptide substrate binding.

Conclusions:

  • Michellamines inhibit protein kinase C (PKC) by binding to its kinase domain.
  • This PKC inhibition represents a novel antiviral mechanism for michellamines.
  • The findings support michellamines as potential therapeutic agents targeting HIV via multiple mechanisms.