5awd
Crystal structure of human TLR8 in complex with N1-4-aminomethylbenzyl (IMDQ)
Structural highlights
FunctionTLR8_HUMAN 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. Acts via MYD88 and TRAF6, leading to NF-kappa-B activation, cytokine secretion and the inflammatory response.[1] Publication Abstract from PubMedHuman Toll-like receptor 8 (hTLR8) is expressed in myeloid dendritic cells, monocytes, and monocyte-derived dendritic cells. Engagement by TLR8 agonists evokes a distinct cytokine profile which favors the development of type 1 helper T cells. Crystal structures of the ectodomain of hTLR8 cocrystallized with two regioisomers of a dual TLR7/8-agonistic N1-substituted imidazoquinolines showed subtle differences in their interactions in the binding site of hTLR8. We hypothesized that the potency of a previously reported best-in-class pure TLR8 agonist, 3-pentylquinoline-2-amine, could be further enhanced by "designing in" functional groups that would mimic key intermolecular interactions that we had observed in the crystal structures. We performed a focused exploration of decorating the quinoline core with alkylamino groups at all possible positions. These studies have led to the identification of a novel TLR8 agonist that was approximately 20-fold more potent than the parent compound and displays prominent adjuvantic activity in a rabbit model of immunization. Structure-Based Design of Human TLR8-Specific Agonists with Augmented Potency and Adjuvanticity.,Beesu M, Caruso G, Salyer AC, Khetani KK, Sil D, Weerasinghe M, Tanji H, Ohto U, Shimizu T, David SA J Med Chem. 2015 Oct 8;58(19):7833-49. doi: 10.1021/acs.jmedchem.5b01087. Epub, 2015 Sep 22. PMID:26351878[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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