4a2q

Structure of duck RIG-I tandem CARDs and helicase domain

spinqualitylabelsall models 4a2q, resolution 3.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4a2q is a 4 chain structure with sequence from Anapl. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 4a2p, 4a2v, 4a2x, 4a36, 4a2w Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed RIG-I is a key innate immune pattern-recognition receptor that triggers interferon expression upon detection of intracellular 5'triphosphate double-stranded RNA (5'ppp-dsRNA) of viral origin. RIG-I comprises N-terminal caspase activation and recruitment domains (CARDs), a DECH helicase, and a C-terminal domain (CTD). We present crystal structures of the ligand-free, autorepressed, and RNA-bound, activated states of RIG-I. Inactive RIG-I has an open conformation with the CARDs sequestered by a helical domain inserted between the two helicase moieties. ATP and dsRNA binding induce a major rearrangement to a closed conformation in which the helicase and CTD bind the blunt end 5'ppp-dsRNA with perfect complementarity but incompatibly with continued CARD binding. We propose that after initial binding of 5'ppp-dsRNA to the flexibly linked CTD, co-operative tight binding of ATP and RNA to the helicase domain liberates the CARDs for downstream signaling. These findings significantly advance our molecular understanding of the activation of innate immune signaling helicases. Structural Basis for the Activation of Innate Immune Pattern-Recognition Receptor RIG-I by Viral RNA.,Kowalinski E, Lunardi T, McCarthy AA, Louber J, Brunel J, Grigorov B, Gerlier D, Cusack S Cell. 2011 Oct 14;147(2):423-35. PMID:22000019 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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