Programmed ribosomal frameshifting in decoding the SARS-CoV genome

  • Pavel V. Baranov
  • , Clark M. Henderson
  • , Christine B. Anderson
  • , Raymond F. Gesteland
  • , John F. Atkins
  • , Michael T. Howard

Research output: Contribution to journalArticlepeer-review

Abstract

Programmed ribosomal frameshifting is an essential mechanism used for the expression of orf1b in coronaviruses. Comparative analysis of the frameshift region reveals a universal shift site U_UUA_AAC, followed by a predicted downstream RNA structure in the form of either a pseudoknot or kissing stem loops. Frameshifting in SARS-CoV has been characterized in cultured mammalian cells using a dual luciferase reporter system and mass spectrometry. Mutagenic analysis of the SARS-CoV shift site and mass spectrometry of an affinity tagged frameshift product confirmed tandem tRNA slippage on the sequence U_UUA_AAC. Analysis of the downstream pseudoknot stimulator of frameshifting in SARS-CoV shows that a proposed RNA secondary structure in loop II and two unpaired nucleotides at the stem I-stem II junction in SARS-CoV are important for frameshift stimulation. These results demonstrate key sequences required for efficient frameshifting, and the utility of mass spectrometry to study ribosomal frameshifting.

Original languageEnglish
Pages (from-to)498-510
Number of pages13
JournalVirology
Volume332
Issue number2
DOIs
Publication statusPublished - 20 Feb 2005

Keywords

  • Alternative decoding
  • Coronavirus
  • Frameshift
  • Mass spectrometry
  • Pseudoknot
  • Recoding
  • SARS
  • Tandem slippage
  • Translation

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