Elevated copy number of L-A virus in yeast mutant strains defective in ribosomal stalk

Biochem Biophys Res Commun. 2007 Apr 6;355(2):575-80. doi: 10.1016/j.bbrc.2007.02.024. Epub 2007 Feb 12.

Abstract

The eukaryotic ribosomal stalk, composed of the P-proteins, is a part of the GTPase-associated-center which is directly responsible for stimulation of translation-factor-dependent GTP hydrolysis. Here we report that yeast mutant strains lacking P1/P2-proteins show high propagation of the yeast L-A virus. Affinity-capture-MS analysis of a protein complex isolated from a yeast mutant strain lacking the P1A/P2B proteins using anti-P0 antibodies showed that the Gag protein, the major coat protein of the L-A capsid, is associated with the ribosomal stalk. Proteomic analysis revealed that the elongation factor eEF1A was also present in the isolated complex. Additionally, yeast strains lacking the P1/P2-proteins are hypersensitive to paromomycin and hygromycin B, underscoring the fact that structural perturbations in the stalk strongly influence the ribosome function, especially at the level of elongation.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Capsid Proteins / metabolism
  • Chromatography, Affinity
  • Electrophoresis, Polyacrylamide Gel
  • Hygromycin B / pharmacology
  • Mutation*
  • Paromomycin / pharmacology
  • Proteome
  • Ribosomes*
  • Saccharomyces cerevisiae / genetics
  • Saccharomyces cerevisiae / virology*
  • Tandem Mass Spectrometry

Substances

  • Capsid Proteins
  • Proteome
  • Hygromycin B
  • Paromomycin