Abstract
Internal ribosome entry site (IRES)-dependent translation is a mechanism distinct from 5′ cap-dependent translation. IRES elements are located mainly in the 5′ untranslated regions (UTRs) of viral and eukaryotic mRNAs. However, IRESs are also found in the coding regions of some viral and eukaryotic genomes to initiate the translation of some functional truncated isoforms. Here, five putative IRES elements of human rhinovirus 16 (HRV16) were identified in the coding region of the nonstructural proteins P2 and P3 through fusion with green fluorescent protein (GFP) expression vectors and bicistronic vectors with a hairpin structure. These five putative IRESs were located at nucleotide positions 4286-4585, 5002-5126, 6245-6394, 6619-6718, and 6629-6778 in the HRV16 genome. The functionality of the five IRESs was confirmed by their ability to initiate GFP expression in vitro. This suggests that an alternative mechanism might be used to increase the efficiency of replication of HRV16.
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Funding
This work was supported by China Mega-Project for Infectious Disease [2018ZX10102001, 2018ZX10711001, 2018ZX10734401 and 2018ZX10734404], SKLID Development Grant (2011SKLID104) and Project of National Pathogen Resource Center (NPRC-32).
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Jun Han designed and conceived the experiments and analyzed the data; Bingtian Shi performed the experiments, analyzed data, and wrote the original draft; Qinqin Song, Xiaonuan Luo, Juan Song, Dong Xia, Zhiqiang Xia, Mi Liu, Wenjun Wang, Ruifang Wang, and Haijun Du supervised data; Jun Han revised the manuscript.
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Shi, B., Song, Q., Luo, X. et al. Identification of cryptic putative IRESs within the ORF encoding the nonstructural proteins of the human rhinovirus 16 genome. Arch Virol 166, 3373–3386 (2021). https://doi.org/10.1007/s00705-021-05209-5
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DOI: https://doi.org/10.1007/s00705-021-05209-5