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. 1992 Jul;66(7):4364–4376. doi: 10.1128/jvi.66.7.4364-4376.1992

Conservation of RNA-protein interactions among picornaviruses.

S L Dildine 1, B L Semler 1
PMCID: PMC241243  PMID: 1602550

Abstract

Picornavirus genomes encode unique 5' noncoding regions (5' NCRs) which are approximately 600 to 1,300 nucleotides in length, contain multiple upstream AUG codons, and display the ability to form extensive secondary structures. A number of recent reports have shown that picornavirus 5' NCRs are able to facilitate cap-independent internal initiation of translation. This mechanism of translation occurs in the absence of viral gene products, suggesting that the host cell contains the necessary components for the cap-independent internal initiation of translation of picornavirus RNAs as well as cellular mRNAs. In an attempt to identify some of the perhaps novel cellular proteins involved in this newly discovered mechanism of translation, we utilized RNA mobility shifts assays to identify and characterize interactions that occur between the 5'NCR of poliovirus type 1 (PV1) and cellular proteins. In this report, we describe two separate interactions between RNA structures from the 5' NCR of PV1 and proteins present in extracts from HeLa cells as well as other cell types. We describe the interaction between nucleotides 186 to 220 (stem-loop D) and a cellular protein(s) present in HeLa cell extracts. Mutational analysis of this stem-loop structure suggests that maintenance of a base-paired structure in the lower stem is necessary to present the sequences which directly interact with the protein(s). We also describe the interaction between nucleotides 220 to 460 (stem-loop E) and a cellular protein present in HeLa cell extracts. This RNA binding activity fractionates to a specific ammonium sulfate fraction (A cut) of a ribosomal salt wash. Mutational analysis of the stem-loop E structure suggests that the preservation of an extensive RNA structure is necessary for a strong interaction with the cellular protein(s), although smaller RNAs derived from this region of the 5' NCR can interact to lesser extents. Finally, we show that both of these RNA-protein interactions are conserved among the closely related enteroviruses PV1 and coxsackievirus type B3, human rhinovirus type 14, and the more distantly related cardiovirus Theiler's murine encephalomyelitis virus, suggesting that such RNA-protein interactions serve basic functions which are conserved and utilized by each of these picornaviruses.

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