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A novel hnRNP specifically interacts with HIV-1 RRE RNA

  • Original Paper
  • Published:
Journal of Biomedical Science

Abstract

We have identified and obtained the full-length clone of RREBP49, a human nuclear factor which specifically interacts with the Rev-responsive element (RRE) sequence of human immunodeficiency virus type 1. Sequence analysis revealed that RREBP49 is highly homologous to hnRNP F protein and contains three repeated RNA-binding domains. Binding assays demonstrated that Rev and RREBP49 bind to different subregions on the RRE sequence and that binding is mutually nonexclusive. Blocking of endogenous RREBP49 expression by an antisense construct increases Rev activity in CV-1 cells, indicating that RREBP49 and Rev may play antagonistic roles in HIV-1 replication. RREBP49 may function as a splicing factor or a nuclear retention factor for unspliced mRNAs. However, only a slight decrease of Rev activity was observed when exogenous RREBP49 was introduced into CV-1 cells by pSVL-RREBP49 expression vector. This may be explained by a high endogenous level of RREBP49 which is above optimal. Alternatively, additional cellular factors may be required for RREBP49-mediated inhibition of Rev.

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Authors and Affiliations

  1. Clayton Foundation Laboratories for Peptide Biology, Salk Institute, La Jolla, Calif., USA

    Wolfgang H. Fischer

  2. Department of Medicine and Biology, University of California at San Diego, 92093-0665, La Jolla, CA, USA

    Yuan Xu, Thipparthi Raghavendar Reddy & Flossie Wong-Staal MD

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  1. Yuan Xu
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  2. Thipparthi Raghavendar Reddy
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  3. Wolfgang H. Fischer
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  4. Flossie Wong-Staal MD
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Xu, Y., Reddy, T.R., Fischer, W.H. et al. A novel hnRNP specifically interacts with HIV-1 RRE RNA. J Biomed Sci 3, 82–91 (1996). https://doi.org/10.1007/BF02255535

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  • DOI: https://doi.org/10.1007/BF02255535

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