The poliovirus 2C cis-acting replication element-mediated uridylylation of VPg is not required for synthesis of negative-sense genomes

IG Goodfellow, C Polacek, R Andino, DJ Evans*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

Abstract

Nucleotides in the terminal loop of the poliovirus 2C cis-acting replication element (2(CRE)), a 61 nt structured RNA, function as the template for the addition of two uridylate (U) residues to the viral protein VPg. This uridylylation reaction leads to the formation of VPgpUpU, which is used by the viral RNA polymerase as a nucleotide-peptide primer for genome replication. Although VPg primes both positive- and negative-strand replication, the specific requirement for 2C(CRE)-mediated uridylylation for one or both events has not been demonstrated. We have used a cell-free in vitro translation and replication reaction to demonstrate that 2C(CRE) is not required for the initiation of the negative-sense strand, which is synthesized in the absence of 2C(CRE)-mediated VPgpUpU formation. We propose that the 3' poly(A) tail could serve as the template for the formation of a VPg-poly(U) primer that functions in the initiation of negative-sense strands.

Original languageEnglish
Pages (from-to)2359-2363
Number of pages5
JournalJournal of General Virology
Volume84
DOIs
Publication statusPublished - Sept 2003

Keywords

  • STRAND RNA-SYNTHESIS
  • 3' UNTRANSLATED REGION
  • VIRAL-RNA
  • 3-NONCODING REGION
  • LINKED PROTEIN
  • IN-VITRO
  • POLYMERASE
  • CRE
  • IDENTIFICATION
  • INITIATION

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