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Related Experiment Videos

Simian immunodeficiency virus reverse transcriptase. Purification and partial characterization.

G Kraus1, E Behr, M Baier

  • 1Paul Ehrlich Institut, Langen/Frankfurt, FRG.

European Journal of Biochemistry
|August 28, 1990
PubMed
Summary
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See all related articles

Simian immunodeficiency virus reverse transcriptase was purified and characterized. Both enzyme subunits showed DNA synthesis activity, with optimal conditions and substrate preferences identified for this crucial retroviral enzyme.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Virology

Background:

  • Simian immunodeficiency virus (SIV) is a lentivirus that shares genetic and structural similarities with human immunodeficiency virus (HIV).
  • Reverse transcriptase (RT) is a key enzyme in the retroviral replication cycle, responsible for synthesizing DNA from an RNA template.

Purpose of the Study:

  • To purify and characterize the native reverse transcriptase from SIV.
  • To determine the optimal reaction conditions and substrate specificities of the SIV RT.
  • To investigate the enzymatic activities and subunit composition of the SIV RT.

Main Methods:

  • Purification of SIV reverse transcriptase from viral particles.
  • Determination of optimal enzyme activity based on divalent cations, pH, and ionic strength.

Related Experiment Videos

  • Assays using various homopolymeric and heteropolymeric substrates to assess RNA-dependent and DNA-dependent DNA synthesis.
  • Determination of Michaelis-Menten constants for nucleotide incorporation.
  • Analysis of enzyme subunit composition using gel electrophoresis and activity gel electrophoresis.

    • Main Results:

    • Native SIV reverse transcriptase was purified to near homogeneity with good recovery.
    • The enzyme exhibits both RNA-dependent and DNA-dependent DNA synthesis activities, along with associated RNase H activity.
    • Optimal reaction conditions were established, and substrate preferences were identified, with activated DNA being a more efficient substrate than homopolymeric substrates.
    • Dideoxyadenosine triphosphate was found to be a competitive inhibitor with respect to dATP and a non-competitive inhibitor for other nucleotides.
    • Gel electrophoresis revealed the enzyme consists of two subunits (64 and 48 kDa), both possessing DNA synthesis activity.

    Conclusions:

    • The purified SIV reverse transcriptase is a functional enzyme with multiple catalytic activities.
    • Understanding the enzyme's properties and substrate utilization is crucial for developing antiviral strategies.
    • Both subunits of the SIV RT are enzymatically active, contributing to viral DNA synthesis.