Molecular mechanism of signal perception and integration by the innate immune sensor retinoic acid-inducible gene-I (RIG-I)

• Verfasst von: Binder, Marco [VerfasserIn]
• Verfasst von: Eberle, Florian [VerfasserIn]
• Verfasst von: Seitz, Stefan [VerfasserIn]
• Verfasst von: Mücke, Norbert [VerfasserIn]
• Verfasst von: Hüber, Christian M. [VerfasserIn]
• Verfasst von: Kiani, Narsis [VerfasserIn]
• Verfasst von: Kaderali, Lars [VerfasserIn]
• Verfasst von: Lohmann, Volker [VerfasserIn]
• Verfasst von: Dalpke, Alexander [VerfasserIn]
• Verfasst von: Bartenschlager, Ralf [VerfasserIn]
• Titel: Molecular mechanism of signal perception and integration by the innate immune sensor retinoic acid-inducible gene-I (RIG-I)
• Verf.angabe: Marco Binder, Florian Eberle, Stefan Seitz, Norbert Mücke, Christian M. Hüber, Narsis Kiani, Lars Kaderali, Volker Lohmann, Alexander Dalpke, and Ralf Bartenschlager
• E-Jahr: 2011
• Jahr: 9 June 2011
• Umfang: 10 S.
• Fussnoten: Gesehen am 24.03.2022
• Titel Quelle: Enthalten in: The journal of biological chemistry
• Ort Quelle: Bethesda, Md. : ASBMB Publications, 1905
• Jahr Quelle: 2011
• Band/Heft Quelle: 286(2011), 31, Seite 27278-27287
• ISSN Quelle: 1083-351X
• DOI: doi:10.1074/jbc.M111.256974
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Double-stranded RNA
• Sach-SW: Innate Immunity
• Sach-SW: Pathogen-associated Molecular Pattern (PAMP)
• Sach-SW: Pattern Recognition Receptor
• Sach-SW: RNA Viruses
• Sach-SW: RNA-Protein Interaction
• Sach-SW: Viral Immunology
• K10plus-PPN: 1796464252

Abstract

RIG-I is a major innate immune sensor for viral infection, triggering an interferon (IFN)-mediated antiviral response upon cytosolic detection of viral RNA. Double-strandedness and 5′-terminal triphosphates were identified as motifs required to elicit optimal immunological signaling. However, very little is known about the response dynamics of the RIG-I pathway, which is crucial for the ability of the cell to react to diverse classes of viral RNA while maintaining self-tolerance. In the present study, we addressed the molecular mechanism of RIG-I signal detection and its translation into pathway activation. By employing highly quantitative methods, we could establish the length of the double-stranded RNA (dsRNA) to be the most critical determinant of response strength. Size exclusion chromatography and direct visualization in scanning force microscopy suggested that this was due to cooperative oligomerization of RIG-I along dsRNA. The initiation efficiency of this oligomerization process critically depended on the presence of high affinity motifs, like a 5′-triphosphate. It is noteworthy that for dsRNA longer than 200 bp, internal initiation could effectively compensate for a lack of terminal triphosphates. In summary, our data demonstrate a very flexible response behavior of the RIG-I pathway, in which sensing and integration of at least two distinct signals, initiation efficiency and double strand length, allow the host cell to mount an antiviral response that is tightly adjusted to the type of the detected signal, such as viral genomes, replication intermediates, or small by-products.