Characterization of an internal ribosome entry site within mRNA 5 of murine hepatitis virus.
The unique region of mRNA 5 of murine hepatitis virus contains two open reading frames, ORF 5a and ORF 5b. The downstream ORF 5b encodes the envelope (E) protein, an integral membrane protein of the virus. We have shown previously that the expression of ORF 5b is mediated by the internal entry of ribosomes. In the experiments reported here, we have used the in vitro translation of synthetic mRNAs to identify the region of mRNA 5 that mediates internal ribosome entry. Our results show that the 5' border of the MHV mRNA 5 IRES element is located between nucleotides 227 and 244 in ORF 5a, while the 3' border is located between nucleotides 140 and 172 in ORF 5b. The MHV mRNA 5 IRES element, therefore, contains not more than 280 nucleotides and encompasses the ORF 5b initiation codon. As evidenced by electrophoretic mobility shift assays, the IRES element of mRNA 5 interacts specifically with protein factors present in an L-cell lysate.
Institute of Virology, University of Würzburg, Germany.
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Jendrach
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Thiel
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Siddell
D000818:Animals; D001483:Base Sequence; D002474:Cell-Free System; D017931:DNA Primers; D007739:L Cells; D051379:Mice; D008969:Molecular Sequence Data; D006517:Murine hepatitis virus / Q000235:genetics* / Q000502:physiology; D016366:Open Reading Frames; D010957:Plasmids; D016133:Polymerase Chain Reaction; D014176:Protein Biosynthesis; D012333:RNA, Messenger / Q000235:genetics* / Q000378:metabolism; D012367:RNA, Viral / Q000235:genetics* / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012270:Ribosomes / Q000821:virology*; D014158:Transcription, Genetic
D017931:DNA Primers; D012333:RNA, Messenger; D012367:RNA, Viral