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Proteolytic processing of Ty3 proteins is required for transposition

J Kirchner1, S Sandmeyer

  • 1Department of Microbiology and Molecular Genetics, University of California, Irvine 92717-4025.

Journal of Virology
|January 1, 1993
PubMed
Summary

The Ty3 protease in yeast Saccharomyces cerevisiae is crucial for processing viral proteins and enabling transposition. Its unique Asp-Ser-Gly active site differs from typical retroviruses, impacting Ty3 particle maturation.

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Area of Science:

  • Molecular Biology
  • Virology
  • Yeast Genetics

Background:

  • Ty3 is a retroviruslike element in Saccharomyces cerevisiae, encoding polyproteins processed into mature viral particles.
  • Retroviral proteases are essential for processing viral polyproteins and are typically aspartyl proteases with an Asp-Thr-Gly motif.

Purpose of the Study:

  • To identify and characterize the Ty3 protease.
  • To investigate its role in Ty3 protein maturation and transposition.
  • To analyze its active site sequence and compare it to known retroviral proteases.

Main Methods:

  • Identification of the Ty3 protease-encoding region.
  • Site-directed mutagenesis of the active-site residues (Asp and Ser).
  • Analysis of polyprotein processing and protein turnover using amino-terminal sequencing.

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Main Results:

  • The Ty3 protease is essential for producing mature Ty3 proteins and for transposition.
  • Ty3 protease possesses an Asp-Ser-Gly active site, distinct from the Asp-Thr-Gly motif in most retroviruses.
  • Mutating the active-site Asp blocked polyprotein processing, while changing Ser to Thr had a minor effect.
  • Five cleavage sites within Ty3 polyproteins were identified, with similarities to retroviral protease cleavage sites.

Conclusions:

  • The Ty3 protease plays a critical role in the Ty3 life cycle, particularly in polyprotein processing and particle formation.
  • The unique Asp-Ser-Gly active site suggests functional divergence from typical retroviral proteases.
  • Further analysis revealed potential downstream-encoded proteins, expanding the understanding of the Ty3 genome.