7wz5 | pdb_00007wz5

Larimichthys crocea IFNi

spinqualitylabelsall models 7wz5, resolution 1.39Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7wz5 is a 1 chain structure with sequence from Larimichthys crocea. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: NAG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A3G3BTG1_LARCR Publication Abstract from PubMed In mammals, type I IFNs, which commonly contain one or two disulfide bonds, activate the JAK-STAT signaling pathway through binding to the common cell surface receptor formed by IFN-alpha/beta receptor (IFNAR)1 and IFNAR2 subunits. Although type I IFNs are also known to be essential for antiviral defense in teleost fish, very little is known about mechanisms underlying the recognition of fish type I IFNs by associated receptors. In this study, we demonstrate that a type I IFN of large yellow croaker Larimichthys crocea (LcIFNi), belonging to a new subgroup of fish type I IFNs, triggers antiviral response via the conserved JAK-STAT pathway through stable binding with a heterodimeric receptor comprising subunits LcCRFB5 and LcCRFB2. LcIFNi binds to LcCRFB5 with a much higher affinity than to LcCRFB2. Furthermore, we determined the crystal structure of LcIFNi at a 1.39 A resolution. The high-resolution structure is, to our knowledge, the first reported structure of a type I IFN with three disulfide bonds, all of which were found to be indispensable for folding and stability of LcIFNi. Using structural analysis, mutagenesis, and biochemical assays, we identified key LcIFNi residues involved in receptor interaction and proposed a structural model of LcIFNi bound to the LcCRFB2-LcCRFB5 receptor. The results show that LcIFNi-LcCRFB2 exhibits a similar binding pattern to human IFN-omega-IFNAR2, whereas the binding pattern of LcIFNi-LcCRFB5 is quite different from that of IFN-omega-IFNAR1. Altogether, our findings reveal the structural basis for receptor interaction and signaling of a type I IFN with three disulfide bonds and provide new insights into the mechanisms underlying type I IFN recognition in teleosts. Molecular and Structural Basis of Receptor Binding and Signaling of a Fish Type I IFN with Three Disulfide Bonds.,Chen J, Guan Y, Guan H, Mu Y, Ding Y, Zou J, Ouyang S, Chen X J Immunol. 2022 Aug 15;209(4):806-819. doi: 10.4049/jimmunol.2200202. Epub 2022 , Jul 29. PMID:35906001 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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