About: Abstract SHAPE technology was used to analyze RNA secondary structure of the 5′ most 474 nts of the MHV-A59 genome encompassing the minimal 5′ cis-acting region required for defective interfering RNA replication. The structures generated were in agreement with previous characterizations of SL1 through SL4 and two recently predicted secondary structure elements, S5 and SL5A. SHAPE provided biochemical support for four additional stem–loops not previously functionally investigated in MHV. Secondary structure predictions for 5′ regions of MHV-A59, BCoV and SARS-CoV were similar despite high sequence divergence. The pattern of SHAPE reactivity of in virio genomic RNA, ex virio genomic RNA, and in vitro synthesized RNA was similar, suggesting that binding of N protein or other proteins to virion RNA fails to protect the RNA from reaction with lipid permeable SHAPE reagent. Reverse genetic experiments suggested that SL5C and SL6 within the nsp1 coding sequence are not required for viral replication.   Goto Sponge  NotDistinct  Permalink

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  • Abstract SHAPE technology was used to analyze RNA secondary structure of the 5′ most 474 nts of the MHV-A59 genome encompassing the minimal 5′ cis-acting region required for defective interfering RNA replication. The structures generated were in agreement with previous characterizations of SL1 through SL4 and two recently predicted secondary structure elements, S5 and SL5A. SHAPE provided biochemical support for four additional stem–loops not previously functionally investigated in MHV. Secondary structure predictions for 5′ regions of MHV-A59, BCoV and SARS-CoV were similar despite high sequence divergence. The pattern of SHAPE reactivity of in virio genomic RNA, ex virio genomic RNA, and in vitro synthesized RNA was similar, suggesting that binding of N protein or other proteins to virion RNA fails to protect the RNA from reaction with lipid permeable SHAPE reagent. Reverse genetic experiments suggested that SL5C and SL6 within the nsp1 coding sequence are not required for viral replication.
Subject
  • Virology
  • Biotechnology
  • RNA
  • DNA
  • Nucleic acids
  • RNA splicing
  • Biophysics
  • Molecular biology
  • Underwater diving physiology
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