Download MendeleyThe Israeli acute paralysis virus IRES captures host ribosomes by mimicking a ribosomal state with hybrid tRNAs.
Acosta-Reyes, F., Neupane, R., Frank, J., Fernandez, I.S.(2019) EMBO J 38: e102226-e102226
- PubMed: 31609474
- DOI: https://doi.org/10.15252/embj.2019102226
- Primary Citation of Related Structures:
6P4G, 6P4H, 6P5I, 6P5J, 6P5K, 6P5N - PubMed Abstract:
Colony collapse disorder (CCD) is a multi-faceted syndrome decimating bee populations worldwide, and a group of viruses of the widely distributed Dicistroviridae family have been identified as a causing agent of CCD. This family of viruses employs non-coding RNA sequences, called internal ribosomal entry sites (IRESs), to precisely exploit the host machinery for viral protein production. Using single-particle cryo-electron microscopy (cryo-EM), we have characterized how the IRES of Israeli acute paralysis virus (IAPV) intergenic region captures and redirects translating ribosomes toward viral RNA messages. We reconstituted two in vitro reactions targeting a pre-translocation and a post-translocation state of the IAPV-IRES in the ribosome, allowing us to identify six structures using image processing classification methods. From these, we reconstructed the trajectory of IAPV-IRES from the early small subunit recruitment to the final post-translocated state in the ribosome. An early commitment of IRES/ribosome complexes for global pre-translocation mimicry explains the high efficiency observed for this IRES. Efforts directed toward fighting CCD by targeting the IAPV-IRES using RNA-interference technology are underway, and the structural framework presented here may assist in further refining these approaches.
Organizational Affiliation:
Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY, USA.
