5WYX

Crystal structure of human TLR8 in complex with CU-CPT8m

Summary for 5WYX

• Entry DOI: 10.2210/pdb5wyx/pdb
• Related: 5WYZ
• Descriptor: Toll-like receptor 8, alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose, 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose, ... (8 entities in total)
• Functional Keywords: immune system
• Biological source: Homo sapiens (Human)
• Total number of polymer chains: 2
• Total formula weight: 191508.19

Authors

Tanji, H.,Ohto, U.,Shimizu, T. (deposition date: 2017-01-16, release date: 2017-12-13, Last modification date: 2024-10-30)

Primary citation

Zhang, S.,Hu, Z.,Tanji, H.,Jiang, S.,Das, N.,Li, J.,Sakaniwa, K.,Jin, J.,Bian, Y.,Ohto, U.,Shimizu, T.,Yin, H.
Small-molecule inhibition of TLR8 through stabilization of its resting state
Nat. Chem. Biol., 14:58-64, 2018

PubMed Abstract: Endosomal Toll-like receptors (TLR3, TLR7, TLR8, and TLR9) are highly analogous sensors for various viral or bacterial RNA and DNA molecular patterns. Nonetheless, few small molecules can selectively modulate these TLRs. In this manuscript, we identified the first human TLR8-specific small-molecule antagonists via a novel inhibition mechanism. Crystal structures of two distinct TLR8-ligand complexes validated a unique binding site on the protein-protein interface of the TLR8 homodimer. Upon binding to this new site, the small-molecule ligands stabilize the preformed TLR8 dimer in its resting state, preventing activation. As a proof of concept of their therapeutic potential, we have demonstrated that these drug-like inhibitors are able to suppress TLR8-mediated proinflammatory signaling in various cell lines, human primary cells, and patient specimens. These results not only suggest a novel strategy for TLR inhibitor design, but also shed critical mechanistic insight into these clinically important immune receptors.

PubMed: 29155428
DOI: 10.1038/nchembio.2518

Experimental method

X-RAY DIFFRACTION (2.4 Å)