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Title: Global shape mimicry of tRNA within a viral internal ribosome entry site mediates translational reading frame selection

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America

The dicistrovirus intergenic region internal ribosome entry site (IRES) adopts a triple-pseudoknotted RNA structure and occupies the core ribosomal E, P, and A sites to directly recruit the ribosome and initiate translation at a non-AUG codon. A subset of dicistrovirus IRESs directs translation in the 0 and +1 frames to produce the viral structural proteins and a +1 overlapping open reading frame called ORFx, respectively. Here we show that specific mutations of two unpaired adenosines located at the core of the three-helical junction of the honey bee dicistrovirusIsraeli acute paralysis virus(IAPV) IRES PKI domain can uncouple 0 and +1 frame translation, suggesting that the structure adopts distinct conformations that contribute to 0 or +1 frame translation. Using a reconstituted translation system, we show that ribosomes assembled on mutant IRESs that direct exclusive 0 or +1 frame translation lack reading frame fidelity. Finally, a nuclear magnetic resonance/small-angle X-ray scattering hybrid approach reveals that the PKI domain of the IAPV IRES adopts an RNA structure that resembles a complete tRNA. Here, the tRNA shape-mimicry enables the viral IRES to gain access to the ribosome tRNA-binding sites and form intermolecular contacts with the ribosome that are necessary for initiating IRES translation in a specific reading frame.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
Canadian Institutes of Health Research; Natural Science and Engineering Resources Council Discovery; National Institutes of Health (NIH); USDOE
Grant/Contract Number:
MOP-81244; RGPIN 341459-12; DMB-8415048; OIA-9977486; S10RR027000; BIR-9214394; GM072447; P41GM103399; S10RR02781; S10RR08438; S10RR023438; S10RR025062; S10RR029220
OSTI ID:
1236267
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 112, Issue 47; ISSN 0027-8424
Publisher:
National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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Cited By (10)

Viral internal ribosomal entry sites: four classes for one goal: Viral internal ribosomal entry sites journal November 2017
Ribosomal frameshifting and transcriptional slippage: From genetic steganography and cryptography to adventitious use journal July 2016
IRES-dependent ribosome repositioning directs translation of a +1 overlapping ORF that enhances viral infection journal November 2018
Dynamics of IRES-mediated translation journal March 2017
The Israeli acute paralysis virus IRES captures host ribosomes by mimicking a ribosomal state with hybrid tRNAs journal October 2019
CSV2018: The 2nd Symposium of the Canadian Society for Virology journal January 2019
Erratum: Molecular analysis of the factorless internal ribosome entry site in Cricket Paralysis virus infection journal April 2017
Ribosomal frameshifting and transcriptional slippage: From genetic steganography and cryptography to adventitious use. journalarticle January 2016
A tRNA-mimic Strategy to Explore the Role of G34 of tRNAGly in Translation and Codon Frameshifting journal August 2019
Structural characterization of ribosome recruitment and translocation by type IV IRES journal May 2016