title: ATP hydrolysis enhances RNA recognition and antiviral signal transduction by the innate immune sensor, laboratory of genetics and physiology 2 (LGP2).
abstract: Laboratory of genetics and physiology 2 (LGP2) is a member of the RIG-I-like receptor family of cytoplasmic pattern recognition receptors that detect molecular signatures of virus infection and initiate antiviral signal transduction cascades. The ATP hydrolysis activity of LGP2 is essential for antiviral signaling, but it has been unclear how the enzymatic properties of LGP2 regulate its biological response. Quantitative analysis of the dsRNA binding and enzymatic activities of LGP2 revealed high dsRNA-independent ATP hydrolysis activity. Biochemical assays and single-molecule analysis of LGP2 and mutant variants that dissociate basal from dsRNA-stimulated ATP hydrolysis demonstrate that LGP2 utilizes basal ATP hydrolysis to enhance and diversify its RNA recognition capacity, enabling the protein to associate with intrinsically poor substrates. This property is required for LGP2 to synergize with another RIG-I-like receptor, MDA5, to potentiate IFNβ transcription in vivo during infection with encephalomyocarditis virus or transfection with poly(I:C). These results demonstrate previously unrecognized properties of LGP2 ATP hydrolysis and RNA interaction and provide a mechanistic basis for a positive regulatory role for LGP2 in antiviral signaling.
authors.affiliation: Department of Molecular Biosciences, Physics and Astronomy, Northwestern University, Evanston,Illinois 60208, USA.
authors.forename: Annie M
authors.initials: AM
authors.lastname: Bruns
authors.forename: Darja
authors.initials: D
authors.lastname: Pollpeter
authors.forename: Nastaran
authors.initials: N
authors.lastname: Hadizadeh
authors.forename: Sua
authors.initials: S
authors.lastname: Myong
authors.forename: John F
authors.initials: JF
authors.lastname: Marko
authors.forename: Curt M
authors.initials: CM
authors.lastname: Horvath
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism*; D000998:Antiviral Agents / Q000378:metabolism*; D001483:Base Sequence; D057809:HEK293 Cells; D006801:Humans; D006868:Hydrolysis; D007113:Immunity, Innate; D016297:Mutagenesis, Site-Directed; D012313:RNA / Q000235:genetics / Q000378:metabolism*; D020365:RNA Helicases / Q000235:genetics / Q000502:physiology*; D015398:Signal Transduction
chemical_list: D000998:Antiviral Agents; D012313:RNA; D000255:Adenosine Triphosphate; C520569:DHX58 protein, human; D020365:RNA Helicases