Translational termination-reinitiation in RNA viruses.
Viruses utilize a number of translational control mechanisms to regulate the relative expression levels of viral proteins on polycistronic mRNAs. One such mechanism, that of termination-dependent reinitiation, has been described in a number of both negative- and positive-strand RNA viruses. Dicistronic RNAs which exhibit termination-reinitiation typically have a start codon of the 3'-ORF (open reading frame) proximal to the stop codon of the upstream ORF. For example, the segment 7 RNA of influenza B is dicistronic, and the stop codon of the M1 ORF and the start codon of the BM2 ORF overlap in the pentanucleotide UAAUG (the stop codon of M1 is shown in bold and the start codon of BM2 is underlined). Recent evidence has highlighted the potential importance of mRNA-rRNA interactions in reinitiation on caliciviral and influenza B viral RNAs, probably used to tether 40S ribosomal subunits to the RNA after termination in time for initiation factors to be recruited to the AUG of the downstream ORF. The present review summarizes how such interactions regulate reinitiation in an array of RNA viruses, and discusses what is known about reinitiation in viruses that do not rely on apparent mRNA-rRNA interactions.
Division of Virology, Department of Pathology, University of Cambridge, Tennis Court Road, Cambridge CB2 1QP, UK. mlp34@cam.ac.uk
Michael L
ML
Powell
D000818:Animals; D001483:Base Sequence; D018387:Codon, Initiator; D018388:Codon, Terminator; D006801:Humans; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D016366:Open Reading Frames; D010442:Peptide Chain Initiation, Translational / Q000235:genetics*; D010443:Peptide Chain Termination, Translational / Q000235:genetics*; D014176:Protein Biosynthesis; D012328:RNA Viruses / Q000235:genetics* / Q000378:metabolism*; D012367:RNA, Viral / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D016415:Sequence Alignment; D014764:Viral Proteins / Q000096:biosynthesis / Q000235:genetics
D018387:Codon, Initiator; D018388:Codon, Terminator; D012367:RNA, Viral; D014764:Viral Proteins