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Re-analysis of cryoEM data on HCV IRES bound to 40S subunit of human ribosome integrated with recent structural information suggests new contact regions between ribosomal proteins and HCV RNA

Joseph, Agnel Praveen and Bhat, Prasanna and Das, Saumitra and Srinivasan, Narayanaswamy (2014) Re-analysis of cryoEM data on HCV IRES bound to 40S subunit of human ribosome integrated with recent structural information suggests new contact regions between ribosomal proteins and HCV RNA. In: RNA BIOLOGY, 11 (7). pp. 891-905.

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Official URL: http://dx.doi.org/ 10.4161/rna.29545

Abstract

In this study, we combine available high resolution structural information on eukaryotic ribosomes with low resolution cryo-EM data on the Hepatitis C Viral RNA (IRES) human ribosome complex. Aided further by the prediction of RNA-protein interactions and restrained docking studies, we gain insights on their interaction at the residue level. We identified the components involved at the major and minor contact regions, and propose that there are energetically favorable local interactions between 40S ribosomal proteins and IRES domains. Domain II of the IRES interacts with ribosomal proteins S5 and S25 while the pseudoknot and the downstream domain IV region bind to ribosomal proteins S26, S28 and S5. We also provide support using UV cross-linking studies to validate our proposition of interaction between the S5 and IRES domains II and IV. We found that domain IIIe makes contact with the ribosomal protein S3a (S1e). Our model also suggests that the ribosomal protein S27 interacts with domain IIIc while S7 has a weak contact with a single base RNA bulge between junction IIIabc and IIId. The interacting residues are highly conserved among mammalian homologs while IRES RNA bases involved in contact do not show strict conservation. IRES RNA binding sites for S25 and S3a show the best conservation among related viral IRESs. The new contacts identified between ribosomal proteins and RNA are consistent with previous independent studies on RNA-binding properties of ribosomal proteins reported in literature, though information at the residue level is not available in previous studies.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the LANDES BIOSCIENCE, 1806 RIO GRANDE ST, AUSTIN, TX 78702 USA
Keywords: RNA-Protein interactions; Cryo electron microscopy; Hepatitis C; Protein modeling
Department/Centre: Division of Biological Sciences > Molecular Biophysics Unit
Division of Biological Sciences > Microbiology & Cell Biology
Depositing User: Id for Latest eprints
Date Deposited: 14 Nov 2014 07:29
Last Modified: 14 Nov 2014 07:29
URI: http://eprints.iisc.ac.in/id/eprint/50279

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