Long-range RNA-RNA interaction between the 5′ nontranslated region and the core-coding sequences of hepatitis C virus modulates the IRES-dependent translation

Yoon Ki Kim, Song Hee Lee, Chon Saeng Kim, Su Kyoung Seol, Sung Key Jang

Research output: Contribution to journalArticle

65 Citations (Scopus)

Abstract

Hepatitis C virus (HCV) is a positive-sense RNA virus ∼9600 bases long. An internal ribosomal entry site (IRES) spans the 5′ nontranslated region, which is the most conserved and highly structured region of the HCV genome. In this study, we demonstrate that nucleotides 428-442 of the HCV core-coding sequence anneal to nucleotides 24-38 of the 5′NTR, and that this RNA-RNA interaction modulates IRES-dependent translation in rabbit reticulocyte lysate and in HepG2 cells. The inclusion of the core-coding sequence (nucleotides 428-442) significantly suppressed the translational efficiency directed by HCV IRES in dicistronic reporter systems, and this suppression was relieved by site-directed mutations that blocked the long-range interaction between nucleotides 24-38 and 428-442. These findings suggest that the long-range interaction between the HCV 5′NTR and the core-coding nucleotide sequence down-regulate cap-independent translation via HCV IRES. The modulation of protein synthesis by long-range RNA-RNA interaction may play a role in the regulation of viral gene expression.

Original languageEnglish
Pages (from-to)599-606
Number of pages8
JournalRNA
Volume9
Issue number5
DOIs
Publication statusPublished - 2003 May 1
Externally publishedYes

Fingerprint

Hepacivirus
RNA
Nucleotides
Viral Gene Expression Regulation
RNA Viruses
Reticulocytes
Hep G2 Cells
Down-Regulation
Genome
Rabbits
Mutation
Proteins

Keywords

  • Core
  • HCV
  • IRES
  • Translation

ASJC Scopus subject areas

  • Genetics
  • Molecular Biology

Cite this

Long-range RNA-RNA interaction between the 5′ nontranslated region and the core-coding sequences of hepatitis C virus modulates the IRES-dependent translation. / Kim, Yoon Ki; Lee, Song Hee; Kim, Chon Saeng; Seol, Su Kyoung; Jang, Sung Key.

In: RNA, Vol. 9, No. 5, 01.05.2003, p. 599-606.

Research output: Contribution to journalArticle

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AU - Jang, Sung Key

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AB - Hepatitis C virus (HCV) is a positive-sense RNA virus ∼9600 bases long. An internal ribosomal entry site (IRES) spans the 5′ nontranslated region, which is the most conserved and highly structured region of the HCV genome. In this study, we demonstrate that nucleotides 428-442 of the HCV core-coding sequence anneal to nucleotides 24-38 of the 5′NTR, and that this RNA-RNA interaction modulates IRES-dependent translation in rabbit reticulocyte lysate and in HepG2 cells. The inclusion of the core-coding sequence (nucleotides 428-442) significantly suppressed the translational efficiency directed by HCV IRES in dicistronic reporter systems, and this suppression was relieved by site-directed mutations that blocked the long-range interaction between nucleotides 24-38 and 428-442. These findings suggest that the long-range interaction between the HCV 5′NTR and the core-coding nucleotide sequence down-regulate cap-independent translation via HCV IRES. The modulation of protein synthesis by long-range RNA-RNA interaction may play a role in the regulation of viral gene expression.

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