The mechanism of translation initiation on Aichivirus RNA mediated by a novel type of picornavirus IRES

Picornavirus mRNAs contain IRESs that sustain their translation during infection, when host protein synthesis is shut off. The major classes of picornavirus IRESs (Types 1 and 2) have distinct structures and sequences, but initiation on both is determined by their specific interaction with eIF4G. We...

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Veröffentlicht in:The EMBO journal 2011-11, Vol.30 (21), p.4423-4436
Hauptverfasser: Yu, Yingpu, Sweeney, Trevor R, Kafasla, Panagiota, Jackson, Richard J, Pestova, Tatyana V, Hellen, Christopher UT
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container_issue 21
container_start_page 4423
container_title The EMBO journal
container_volume 30
creator Yu, Yingpu
Sweeney, Trevor R
Kafasla, Panagiota
Jackson, Richard J
Pestova, Tatyana V
Hellen, Christopher UT
description Picornavirus mRNAs contain IRESs that sustain their translation during infection, when host protein synthesis is shut off. The major classes of picornavirus IRESs (Types 1 and 2) have distinct structures and sequences, but initiation on both is determined by their specific interaction with eIF4G. We report here that Aichivirus (AV), a member of the Kobuvirus genus of Picornaviridae , contains an IRES that differs structurally from Type 1 and Type 2 IRESs. Its function similarly involves interaction with eIF4G, but its eIF4G‐interacting domain is structurally distinct, although it contains an apical eIF4G‐interacting motif similar to that in Type 2 IRESs. Like Type 1 and Type 2 IRESs, AV IRES function is enhanced by pyrimidine tract‐binding protein (PTB), but the pattern of PTB's interaction with each of these IRESs is distinct. Unlike all known IRESs, the AV IRES is absolutely dependent on DHX29, a requirement imposed by sequestration of its initiation codon in a stable hairpin. Picornavirus mRNAs contain internal ribosomal entry sites (IRESs) that mediate translation during infection, when global host protein synthesis is inhibited. Aichi Virus harbours a novel type of IRES that needs the DExH‐box helicase DHX29 for function.
doi_str_mv 10.1038/emboj.2011.306
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The major classes of picornavirus IRESs (Types 1 and 2) have distinct structures and sequences, but initiation on both is determined by their specific interaction with eIF4G. We report here that Aichivirus (AV), a member of the Kobuvirus genus of Picornaviridae , contains an IRES that differs structurally from Type 1 and Type 2 IRESs. Its function similarly involves interaction with eIF4G, but its eIF4G‐interacting domain is structurally distinct, although it contains an apical eIF4G‐interacting motif similar to that in Type 2 IRESs. Like Type 1 and Type 2 IRESs, AV IRES function is enhanced by pyrimidine tract‐binding protein (PTB), but the pattern of PTB's interaction with each of these IRESs is distinct. Unlike all known IRESs, the AV IRES is absolutely dependent on DHX29, a requirement imposed by sequestration of its initiation codon in a stable hairpin. 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The major classes of picornavirus IRESs (Types 1 and 2) have distinct structures and sequences, but initiation on both is determined by their specific interaction with eIF4G. We report here that Aichivirus (AV), a member of the Kobuvirus genus of Picornaviridae , contains an IRES that differs structurally from Type 1 and Type 2 IRESs. Its function similarly involves interaction with eIF4G, but its eIF4G‐interacting domain is structurally distinct, although it contains an apical eIF4G‐interacting motif similar to that in Type 2 IRESs. Like Type 1 and Type 2 IRESs, AV IRES function is enhanced by pyrimidine tract‐binding protein (PTB), but the pattern of PTB's interaction with each of these IRESs is distinct. Unlike all known IRESs, the AV IRES is absolutely dependent on DHX29, a requirement imposed by sequestration of its initiation codon in a stable hairpin. Picornavirus mRNAs contain internal ribosomal entry sites (IRESs) that mediate translation during infection, when global host protein synthesis is inhibited. Aichi Virus harbours a novel type of IRES that needs the DExH‐box helicase DHX29 for function.</abstract><cop>Chichester, UK</cop><pub>John Wiley &amp; Sons, Ltd</pub><pmid>21873976</pmid><doi>10.1038/emboj.2011.306</doi><tpages>14</tpages><oa>free_for_read</oa></addata></record>
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subjects 5' Untranslated Regions - genetics
Aichivirus
Base Sequence
Binding Sites - genetics
DHX29
eIF4G
EMBO23
EMBO31
Gene Expression Regulation, Viral
IRES
Kobuvirus - genetics
Models, Molecular
Molecular biology
Molecular Sequence Data
Nucleic Acid Conformation
Peptide Chain Initiation, Translational - genetics
Picornaviridae
Picornaviridae - genetics
Picornaviridae - metabolism
Picornavirus
Protein Biosynthesis - genetics
Protein Biosynthesis - physiology
Protein synthesis
PTB
Regulatory Elements, Transcriptional - genetics
Regulatory Elements, Transcriptional - physiology
Ribonucleic acid
Ribosomes - metabolism
RNA
RNA, Viral - chemistry
RNA, Viral - genetics
RNA, Viral - metabolism
Viruses
title The mechanism of translation initiation on Aichivirus RNA mediated by a novel type of picornavirus IRES
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