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Cellular proteins bind to the 3' end of Sindbis virus minus-strand RNA.

Abstract : Forty-four nucleotides at the 5' terminus of the genomic RNA of Sindbis virus can form a stable stem-loop structure and have been shown previously to be important for viral replication. The structure formed by the complement of this sequence at the 3' end of the minus-strand RNA has been proposed to be a promoter for RNA replication and as such might be bound in a specific fashion by proteins of either cellular or viral origin. Short oligonucleotide probes (either 62 or 132 nucleotides) representing the 3'-terminal sequence of the minus strand were prepared. When added to extracts from infected or uninfected cells, these probes were bound by cellular proteins, as evidenced by a shift in the electrophoretic mobility of the (labeled) oligonucleotide. Competition experiments confirmed the specificity of the interaction. Proteins of apparent molecular sizes 42 and 44 kDa, and to a lesser extent 52 kDa, could be cross-linked to the minus-sense probes by UV irradiation. A mutant minus-strand probe identical to the longer probe except for a single-nucleotide deletion corresponding to nucleotide 5 in the genomic RNA, which is lethal for the virus, was also found to bind the same proteins as the wild-type probe. The half-life of the mutant probe-cellular protein complex was threefold longer than that of the wild-type complex, however, indicating that the mutant probe was bound more tightly than the wild-type probe. We hypothesize that the binding of cellular factors may be transiently required for initiation of transcription of plus-strand RNA from the minus-strand template and that overly tight binding of such factors is deleterious for RNA replication.
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Contributor : Nathalie Pardigon Connect in order to contact the contributor
Submitted on : Friday, December 8, 2017 - 12:55:02 PM
Last modification on : Wednesday, December 27, 2017 - 11:41:43 AM

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  • HAL Id : pasteur-01659384, version 1
  • PUBMED : 1731089



N. Pardigon, J H Strauss. Cellular proteins bind to the 3' end of Sindbis virus minus-strand RNA.. Journal of Virology, American Society for Microbiology, 1992, 66 (2), pp.1007-15. ⟨pasteur-01659384⟩



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