La autoantigen suppresses IRES-dependent translation of the hepatitis A virus |
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Authors: | Cordes Susann Kusov Yuri Heise Tilman Gauss-Müller Verena |
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Institution: | a Institute of Medical Molecular Biology, University of Lübeck, Ratzeburger Allee 160, D-23538 Lübeck, Germany b Medical University of South Carolina (MUSC), Department of Biochemistry & Molecular Biology, Charleston, USA |
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Abstract: | The human RNA-binding protein La, is an essential trans-acting factor in IRES-dependent translation initiation of poliovirus, the prototypic picornavirus. For hepatitis A virus (HAV), an unusual member of this virus family, the role of host proteins in its inefficient translation and slow replication is unclear. Using small interfering RNA in vivo and purified La in vitro, we demonstrate for the first time that La suppresses HAV IRES-mediated translation and replication. We show that La binds specifically to distinct parts of the HAV IRES and that—unlike poliovirus—HAV proteinase 3C does not cleave La. The La-mediated suppression of HAV translation and stimulation of poliovirus translation implies unexpected mechanistic differences between viral IRES elements. |
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Keywords: | Poliovirus RNA-binding RNA secondary structure EMSA IRES 3C cleavage La RNAi |
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