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Related Experiment Videos

Proteolytic processing of Semliki Forest virus-specific non-structural polyprotein.

K Takkinen1, J Peränen, L Kääriäinen

  • 1Institute of Biotechnology, University of Helsinki, Finland.

The Journal of General Virology
|July 1, 1991
PubMed
Summary

Semliki Forest virus non-structural (ns) proteins, including P1234, are processed during translation. Mature ns proteins are stable, with nsP4 produced early via nascent cleavage.

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Site-specific protease activity of the carboxyl-terminal domain of Semliki Forest virus replicase protein nsP2.

The Journal of biological chemistry·2001

Area of Science:

  • Virology
  • Molecular Biology
  • Protein Biochemistry

Background:

  • Semliki Forest virus (SFV) non-structural (ns) proteins are essential for viral replication.
  • Understanding the processing and stability of these ns proteins is crucial for deciphering viral mechanisms.

Purpose of the Study:

  • To investigate the in vivo processing and stability of Semliki Forest virus non-structural (ns) proteins.
  • To elucidate the mechanisms of ns protein maturation and potential precursor processing pathways.

Main Methods:

  • Immunoprecipitation of virus-specific proteins from infected cells using monospecific antisera.
  • Pulse-chase experiments to track protein stability and processing over time.
  • In vitro translation using mRNA from cDNA clones with specific mutations or deletions.

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Main Results:

  • The complete ns precursor P1234 is processed into P123 and nsP4 during translation.
  • Mature ns proteins exhibit relative stability for at least 2 hours post-synthesis.
  • Mutant studies suggest nsP4 is produced by nascent cleavage, while nsP1/2 and nsP2/3 cleavages are mediated by the nsP2 proteinase domain.

Conclusions:

  • Nascent cleavage is critical for nsP4 production, independent of other ns protein processing.
  • The nsP2 proteinase domain catalyzes proteolytic cleavages at the nsP1/2 and nsP2/3 sites.
  • The processing pathway of Semliki Forest virus ns proteins involves coordinated proteolytic events during and after translation.