Interaction of polypyrimidine tract-binding protein with the 5' noncoding region of the hepatitis C virus RNA genome and its functional requirement in internal initiation of translation

DOI Web Site 被引用文献5件
  • N Ali
    Department of Microbiology, University of Colorado Health Sciences Center, Denver 80262, USA.
  • A Siddiqui
    Department of Microbiology, University of Colorado Health Sciences Center, Denver 80262, USA.

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<jats:p>Initiation of translation of the human hepatitis C virus (HCV) RNA genome occurs by internal ribosome entry into the 5' noncoding region (5'NCR) in a cap-independent manner. The internal ribosome entry site of the HCV 5'NCR has been previously defined to encompass almost the entire 5'NCR. Here we report the interaction of polypyrimidine tract-binding protein (PTB) at three distinct regions within the 5'NCR by UV cross-linking assays. All three regions contain a consensus polypyrimidine tract motif. The evidence for the interaction of recombinant PTB at multiple sites within the 5'NCR is based on the use of 5'NCR mutants as competitors and by direct UV cross-linking of the mutant RNAs. Furthermore, the PTB isomers from HeLa nuclear extracts interact with the HCV 5'NCR, as shown by immunoprecipitation of a UV cross-linked complex with anti-PTB serum. Immunodepletion of PTB from translation lysates suggested the functional requirement for PTB during translation initiation of the HCV RNA. Addition of purified PTB to immunodepleted lysates did not restore translation mediated by the HCV 5'NCR, indicating the requirement of PTB-associated factors that were removed during immunodepletion.</jats:p>

収録刊行物

  • Journal of Virology

    Journal of Virology 69 (10), 6367-6375, 1995-10

    American Society for Microbiology

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