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The sequence features important for plus strand priming by human immunodeficiency virus type 1 reverse transcriptase

K A Pullen1, A J Rattray, J J Champoux

  • 1Department of Microbiology, School of Medicine, University of Washington, Seattle 98195.

The Journal of Biological Chemistry
|March 25, 1993
PubMed
Summary
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Researchers investigated how reverse transcriptase enzymes initiate DNA synthesis. They found that while both Moloney murine leukemia virus (M-MuLV) and human immunodeficiency virus type 1 (HIV-1) use similar polypurine tracts (PPTs), the specific DNA sequences critical for priming differ between the two viruses.

Area of Science:

  • Molecular Biology
  • Virology
  • Enzymology

Background:

  • Reverse transcriptase enzymes are crucial for viral replication, synthesizing DNA from RNA templates.
  • The RNase H activity of reverse transcriptase cleaves RNA primers, initiating plus-strand DNA synthesis.
  • The polypurine tract (PPT) is a key sequence element directing this cleavage and priming event.

Purpose of the Study:

  • To investigate the sequence requirements for human immunodeficiency virus type 1 (HIV-1) reverse transcriptase-mediated plus-strand DNA priming at the polypurine tract (PPT).
  • To compare the priming specificity of HIV-1 reverse transcriptase with that of Moloney murine leukemia virus (M-MuLV) reverse transcriptase.
  • To identify critical nucleotide residues within the PPT that dictate RNase H cleavage site selection for HIV-1.

Main Methods:

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  • Utilized site-directed mutagenesis to generate a series of polypurine tract (PPT) mutants in both Moloney murine leukemia virus (M-MuLV) and human immunodeficiency virus type 1 (HIV-1).
  • Assessed the ability of HIV-1 reverse transcriptase to initiate plus-strand DNA synthesis using M-MuLV PPT sequences in vitro.
  • Analyzed the specificity of RNase H-mediated cleavage at the PPT in the presence of HIV-1 reverse transcriptase and various PPT mutants.

Main Results:

  • HIV-1 reverse transcriptase can utilize the M-MuLV PPT as an origin for plus-strand DNA initiation in vitro.
  • Despite sequence similarities in the PPT region between M-MuLV and HIV-1, the critical determinants for RNase H cleavage and primer generation differ significantly.
  • For HIV-1, the -2G and -4G residues within the PPT are key determinants of priming specificity, contrasting with the -7A residue critical for M-MuLV.

Conclusions:

  • The sequence features governing RNase H positioning and cleavage for plus-strand priming are virus-specific, even for closely related functional elements like the PPT.
  • Understanding these sequence specificities is vital for comprehending viral replication mechanisms and for developing targeted antiviral therapies.
  • The study highlights distinct molecular recognition mechanisms employed by different retroviral reverse transcriptases at the polypurine tract.