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Related Experiment Videos

Reverse transcriptase from human immunodeficiency virus: a single template-primer binding site serves two physically

M S Krug1, S L Berger

  • 1Section on Genes and Gene Products, National Cancer Institute, NIH, Bethesda, MD 20892.

Biochemistry
|November 5, 1991
PubMed
Summary
This summary is machine-generated.

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This study compares human immunodeficiency virus (HIV) reverse transcriptase and avian myeloblastosis virus (AMV) enzyme kinetics. Both enzymes exhibit similar substrate binding and catalytic rates for RNA-dependent DNA polymerase and ribonuclease H activities.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Reverse transcriptase (RT) is crucial for retroviral replication.
  • Understanding RT substrate binding and enzymatic activities is key to developing inhibitors.
  • Comparing HIV RT with other viral enzymes like AMV RT provides insights into conserved and divergent mechanisms.

Purpose of the Study:

  • To analyze and compare the substrate binding kinetics of recombinant human immunodeficiency virus (HIV) reverse transcriptase and avian myeloblastosis virus (AMV) enzyme.
  • To investigate the ribonuclease H and RNA-dependent DNA polymerase activities of both enzymes.
  • To characterize the interaction of substrates and inhibitors with HIV reverse transcriptase.

Main Methods:

  • Enzymatic assays were performed using 3'-end-labeled globin mRNA hybridized to (dT)15 as a substrate for ribonuclease H activity.

Related Experiment Videos

  • Kinetic constants (Km, KD, kcat) were determined for both ribonuclease H and RNA-dependent DNA polymerase activities.
  • Inhibition studies were conducted using ribonucleoside-vanadyl complexes and deoxyribonucleoside triphosphates.

    • Main Results:

    • Both HIV and AMV reverse transcriptases exhibited biphasic kinetics for ribonuclease H activity, with comparable kinetic constants.
    • The rates of template-primer association and dissociation were similar for both enzymes.
    • HIV and AMV reverse transcriptases showed comparable Km and kcat values for RNA-dependent DNA polymerase activity.
    • Ribonucleoside-vanadyl complexes competitively inhibited both polymerase and ribonuclease H activities of HIV RT.
    • Deoxyribonucleoside triphosphates showed mixed inhibition in the polymerase reaction and facilitated active enzyme formation without affecting ribonuclease H kinetics.

    Conclusions:

    • HIV and AMV reverse transcriptases share similar substrate binding and catalytic properties for both polymerase and ribonuclease H functions.
    • A single template-primer binding site likely accommodates both the polymerase and ribonuclease H catalytic sites.
    • These findings contribute to understanding the mechanism of reverse transcription and provide a basis for antiviral drug development.