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Human immunodeficiency virus reverse transcriptase-associated RNase H activity.

M C Starnes1, Y C Cheng

  • 1Department of Pharmacology, School of Medicine, University of North Carolina, Chapel Hill 27599-7365.

The Journal of Biological Chemistry
|April 25, 1989
PubMed
Summary
This summary is machine-generated.

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Human immunodeficiency virus (HIV) reverse transcriptase (RT) possesses an integral RNase H activity. This enzyme shows specific substrate preferences and distinct optimal conditions compared to other retroviral RNase H activities.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Virology

Background:

  • Human immunodeficiency virus (HIV) reverse transcriptase (RT) is crucial for viral replication.
  • The enzymatic activities of HIV RT, including RNase H, are key targets for antiviral therapies.

Purpose of the Study:

  • To biochemically characterize the RNase H activity associated with purified HIV RT.
  • To determine the substrate specificity, optimal conditions, and molecular properties of HIV RNase H.

Main Methods:

  • Immunoaffinity purification of HIV RT.
  • Glycerol gradient centrifugation to determine molecular weight.
  • Enzyme activity assays with various substrates and conditions (pH, salt, Mg2+).
  • Activity gel analysis to identify the enzyme component responsible for RNase H activity.

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Main Results:

  • HIV RT-associated RNase H activity co-purified with RT and had an apparent molecular weight of 110,000.
  • HIV RNase H demonstrated a preference for poly(dC).[3H]poly(rG) and did not degrade single-stranded RNA or DNA in hybrids.
  • Optimal activity was observed at pH 8.0-8.5 and was dependent on Mg2+ (4-12 mM).
  • RNase H activity was associated with the p66 component of HIV RT.

Conclusions:

  • HIV RT possesses an intrinsic RNase H activity.
  • This activity exhibits distinct biochemical properties and optimal assay conditions compared to RNase H from other retroviral RTs.
  • Understanding these characteristics is important for developing targeted HIV therapies.