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Related Experiment Videos

A Ty1 reverse transcriptase active-site aspartate mutation blocks transposition but not polymerization.

O Uzun1, A Gabriel

  • 1Graduate Program in Biochemistry and Molecular Biology, Robert Wood Johnson Medical School, University of Medicine and Dentistry of New Jersey, 689 Hoes Lane, Piscataway, NJ 08854.

Journal of Virology
|June 20, 2001
PubMed
Summary
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This study reveals that one active-site aspartate in yeast retrotransposon Ty1 reverse transcriptase (RT) is not essential for polymerase activity. Mutations in one domain of RT can significantly impact distant functional domains.

Area of Science:

  • Molecular Biology
  • Genetics
  • Virology

Background:

  • Reverse transcriptases (RTs) are crucial enzymes in mobile genetic elements like viruses and retrotransposons.
  • A conserved triad of aspartate residues is traditionally considered essential for RT catalytic function.

Purpose of the Study:

  • To investigate the functional necessity of the invariant aspartate triad in the catalytic activity of the yeast retrotransposon Ty1 reverse transcriptase.
  • To explore the relationship between polymerase activity and transposition efficiency in vivo.

Main Methods:

  • Site-directed mutagenesis of conserved aspartate residues in the Ty1 RT active site.
  • In vitro polymerase activity assays using virus-like particles.
  • Analysis of in vivo transposition and intermediate synthesis steps.

Related Experiment Videos

  • Identification of suppressor mutations in the RNase H domain.

    • Main Results:

    • Most RT mutants lost detectable polymerase activity.
    • The D211N mutant retained significant in vitro polymerase activity but failed in vivo transposition.
    • Minus-strand synthesis and plus-strand strong-stop intermediate formation were impaired in the D211N mutant.
    • Suppressor mutations localized to the RNase H domain, distant from the active site.

    Conclusions:

    • One active-site aspartate in Ty1 RT is not catalytically critical for polymerase function.
    • This finding suggests structural differences in the active site compared to other RTs, such as HIV RT.
    • Mutations in one RT domain can profoundly affect the function of other domains, highlighting enzyme complexity.