A common structural core in the internal ribosome entry sites of picornavirus, hepatitis C virus, and pestivirus.

Abstract:

:Cap-independent translations of viral RNAs of enteroviruses and rhinoviruses, cardioviruses and aphthoviruses, hepatitis A and C viruses (HAV and HCV), and pestivirus are initiated by the direct binding of 40S ribosomal subunits to a cis-acting genetic element termed the internal ribosome entry site (IRES) or ribosome landing pad (RLP) in the 5' noncoding region (5'NCR). RNA higher ordered structure models for these IRES elements were derived by a combined approach using thermodynamic RNA folding, Monte Carlo simulation, and phylogenetic comparative analysis. The structural differences among the three groups of picornaviruses arise not only from point mutations, but also from the addition or deletion of structural domains. However, a common core can be identified in the proposed structural models of these IRES elements from enteroviruses and rhinoviruses, cardioviruses and aphthoviruses, and HAV. The common structural core identified within the picornavirus IRES is also conserved in the 5'NCR of the divergent viruses, HCV, and pestiviruses. Furthermore, the proposed structural motif shares a structural feature similar to that observed in the catalytic core of the group 1 intron. The conserved structural motif from these divergent sequences that looks like the common core region of group 1 introns is probably a crucial element involved in the IRES-dependent translation.

journal_name

Virus Genes

journal_title

Virus genes

authors

Le SY,Siddiqui A,Maizel JV Jr

doi

10.1007/BF00572952

subject

Has Abstract

pub_date

1996-01-01 00:00:00

pages

135-47

issue

2

eissn

0920-8569

issn

1572-994X

journal_volume

12

pub_type

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