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Probing interactions between HIV-1 reverse transcriptase and its DNA substrate with backbone-modified nucleotides.

A Marx1, M Spichty, M Amacker

  • 1Department of Chemistry, University of Basel, Switzerland.

Chemistry & Biology
|February 18, 1999
PubMed
Summary

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Modified nucleotides reveal how human immunodeficiency virus type 1 reverse transcriptase (HIV-1 RT) interacts with DNA. Strand elongation efficiency correlates with distances between the DNA and enzyme, offering structural insights.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Crystal structures provide molecular insights into enzyme catalysis.
  • Enzyme conformations may not always reflect in vivo reactivity.
  • Transition state rates are crucial for elucidating reaction mechanisms.

Purpose of the Study:

  • To investigate the interplay between human immunodeficiency virus type 1 reverse transcriptase (HIV-1 RT) and its DNA substrate.
  • To develop a methodology for probing protein-DNA interactions.
  • To correlate structural information with enzyme reactivity.

Main Methods:

  • Modification of the DNA substrate's sugar backbone with a substituent.
  • Monitoring strand elongation efficiency after incorporation of modified nucleotides.

Related Experiment Videos

  • Correlating reaction efficiencies with the distance between the sugar substituent and the enzyme.
  • Kinetic experiments with HIV-1 RT mutants.

    • Main Results:

    • Strand elongation efficiency exhibited discontinuous behavior for the first four nucleotides after incorporating the modified nucleotide.
    • Reaction efficiencies were correlated with the distance between the sugar substituent and the enzyme.
    • The developed model was validated by kinetic experiments with HIV-1 RT mutants.

    Conclusions:

    • Strand elongation efficiency using modified nucleotides correlates with DNA-enzyme distances in HIV-1 RT.
    • Modified nucleotides act as 'antennae' sensing steric interactions and altering the transition state.
    • Combining kinetic experiments with backbone-modified nucleotides offers a method to obtain structural information on reverse transcriptases and DNA polymerases.