In vitro molecular characterization of RNA-proteins interactions during initiation of translation of a wild-type and a mutant Coxsackievirus B3 RNAs.

Abstract:

:Translation initiation of Coxsackievirus B3 (CVB3) RNA is directed by an internal ribosome entry site (IRES) within the 5' untranslated region. Host cell factors involved in this process include some canonical translation factors and additional RNA-binding proteins. We have, previously, described that the Sabin3-like mutation (U475 → C) introduced in CVB3 genome led to a defective mutant with a serious reduction in translation efficiency. With the aim to identify proteins interacting with CVB3 wild-type and Sabin3-like IRESes and to study interactions between HeLa cell or BHK-21 protein extracts and CVB3 RNAs, UV-cross-linking assays were performed. We have observed a number of proteins that specifically interact with both RNAs. In particular, molecular weights of five of these proteins resemble to those of the eukaryotic translation initiation factors 4G, 3b, 4B, and PTB. According to cross-linking patterns obtained, we have demonstrated a better affinity of CVB3 RNA binding to BHK-21 proteins and a reduced interaction of the mutant RNA with almost cellular polypeptides compared to the wild-type IRES. On the basis of phylogeny of some initiation factors and on the knowledge of the initiation of translation process, we focused on the interaction of both IRESes with eIF3, p100 (eIF4G), and 40S ribosomal subunit by filter-binding assays. We have demonstrated a better affinity of binding to the wild-type CVB3 IRES. Thus, the reduction efficiency of the mutant RNA to bind to cellular proteins involved in the translation initiation could be the reason behind inefficient IRES function.

journal_name

Mol Biotechnol

journal_title

Molecular biotechnology

authors

Souii A,M'hadheb-Gharbi MB,Aouni M,Gharbi J

doi

10.1007/s12033-012-9592-x

subject

Has Abstract

pub_date

2013-06-01 00:00:00

pages

515-27

issue

2

eissn

1073-6085

issn

1559-0305

journal_volume

54

pub_type

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