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10.1093/nar/gkx1307

http://scihub22266oqcxt.onion/10.1093/nar/gkx1307
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suck abstract from ncbi


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pmid29346611
      Nucleic+Acids+Res 2018 ; 46 (6 ): 3169-3186
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  • Combined roles of ATP and small hairpin RNA in the activation of RIG-I revealed by solution-based analysis #MMPMID29346611
  • Shah N ; Beckham SA ; Wilce JA ; Wilce MCJ
  • Nucleic Acids Res 2018[Apr]; 46 (6 ): 3169-3186 PMID29346611 show ga
  • RIG-I (retinoic acid inducible gene-I) is a cytosolic innate immune protein that senses viral dsRNA with a 5'-triphosphate overhang. Upon interaction with dsRNA a de-repression of the RIG-I CARD domains takes place that ultimately leads to the production of type I interferons and pro-inflammatory cytokines. Here we investigate the RIG-I conformational rearrangement upon interaction with an activating 5'-triphosphate-10-base pair dsRNA hairpin loop (10bp) compared with a less active 5'-triphosphate-8-base pair dsRNA hairpin loop (8bp). We use size-exclusion chromatography-coupled small-angle X-ray scattering (SAXS) and limited tryptic digest experiments to show that that upon binding to 10 bp, but not 8 bp, RIG-I becomes extended and shows greater flexibility, reflecting the release of its CARDs. We also examined the effect of different ATP analogues on the conformational changes of RIG-I/dsRNA complexes. Of the analogues tested, the addition of ATP transition state analogue ADP-AlFx further assisted in the complete activation of RIG-I in complex with 10bp and also to some extent RIG-I bound to 8bp. Together these data provide solution-based evidence for the molecular mechanism of innate immune signaling by RIG-I as stimulated by short hairpin RNA and ATP.
  • |*Protein Domains [MESH]
  • |Adenosine Triphosphate/*chemistry/metabolism [MESH]
  • |Base Sequence [MESH]
  • |Chromatography, Gel [MESH]
  • |DEAD Box Protein 58/*chemistry/metabolism [MESH]
  • |Humans [MESH]
  • |Models, Molecular [MESH]
  • |Nucleic Acid Conformation [MESH]
  • |Protein Binding [MESH]
  • |RNA, Double-Stranded/*chemistry/genetics/metabolism [MESH]
  • |Receptors, Immunologic [MESH]
  • |Scattering, Small Angle [MESH]
  • |Signal Transduction [MESH]
  • |Solutions/chemistry [MESH]


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