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Related Experiment Videos

3C-like protease encoded by Rice tungro spherical virus is autocatalytically processed.

H Sekiguchi1, M Isogai, C Masuta

  • 1Pathogen-Plant Interactions Group, Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan.

Archives of Virology
|October 27, 2004
PubMed
Summary

Rice tungro spherical virus protease self-cleaves, with a key site identified in its C-terminal half. A mutation at this site abolished protease activity, confirming its importance for RTSV protease function.

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Area of Science:

  • Virology
  • Molecular Biology
  • Protein Biochemistry

Background:

  • Rice tungro spherical virus (RTSV) encodes a 3C-protease essential for viral replication.
  • This protease exhibits both cis- and trans-acting cleavage activities.
  • In vitro translation studies indicated the protease undergoes self-cleavage.

Purpose of the Study:

  • To investigate the self-cleavage mechanism of the RTSV 3C-protease.
  • To identify the major self-cleavage site within the protease.
  • To elucidate the role of specific residues in protease recognition and activity.

Main Methods:

  • Production of RTSV 3C-protease in Escherichia coli as a maltose-binding protein (MBP) fusion.
  • Purification of the protease using MBP affinity chromatography.

Related Experiment Videos

  • Site-directed mutagenesis to alter a potential self-cleavage site (C2763).
  • Analysis of protein products and catalytic activity.

    • Main Results:

    • Two forms of the RTSV 3C-protease were purified, suggesting internal cleavage.
    • Analysis indicated a major self-cleavage site resides in the C-terminal half of the protease.
    • A point mutation at C2763 abolished the protease's catalytic activity.
    • The mutated site is crucial for the protease's self-recognition and function.

    Conclusions:

    • The RTSV 3C-protease possesses an intrinsic self-cleavage capability.
    • A critical self-cleavage site is located in the C-terminal region, specifically at C2763.
    • This site is vital for the protease's catalytic activity and substrate recognition, highlighting its importance in viral processing.