5y3k | pdb_00005y3k
Crystal structure of horse TLR9 in complex with two DNAs (CpG DNA and GCGCAC DNA)
Structural highlights
FunctionTLR9_HORSE Key component of innate and adaptive immunity. TLRs (Toll-like receptors) control host immune response against pathogens through recognition of molecular patterns specific to microorganisms. TLR9 is a nucleotide-sensing TLR which is activated by unmethylated cytidine-phosphate-guanosine (CpG) dinucleotides. Acts via MYD88 and TRAF6, leading to NF-kappa-B activation, cytokine secretion and the inflammatory response. Upon CpG stimulation, induces B-cell proliferation, activation, survival and antibody production (By similarity).[UniProtKB:Q9NR96][1] Publication Abstract from PubMedToll-like receptor 9 (TLR9) recognizes DNA containing CpG motifs derived from bacteria and viruses and activates the innate immune response to eliminate them. TLR9 is known to bind to CpG DNA, and here, we identified another DNA binding site in TLR9 that binds DNA containing cytosine at the second position from the 5' end (5'-xCx DNA). 5'-xCx DNAs bound to TLR9 in the presence of CpG DNA and cooperatively promoted dimerization and activation of TLR9. Binding at both sites was important for efficient activation of TLR9. The 5'-xCx DNA bound the site corresponding to the nucleoside binding site in TLR7 and TLR8 as revealed by the structural analysis. This study revealed that TLR9 recognizes two types of DNA through its two binding sites for efficient activation. This information may contribute to the development of drugs that control the activity of TLR9. Toll-like Receptor 9 Contains Two DNA Binding Sites that Function Cooperatively to Promote Receptor Dimerization and Activation.,Ohto U, Ishida H, Shibata T, Sato R, Miyake K, Shimizu T Immunity. 2018 Mar 24. pii: S1074-7613(18)30089-X. doi:, 10.1016/j.immuni.2018.03.013. PMID:29625894[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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