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Small-Molecule TLR8 Antagonists via Structure-Based Rational Design.

Zhenyi Hu1, Hiromi Tanji2, Shuangshuang Jiang3

  • 1Department of Chemistry and Biochemistry and BioFrontiers Institute, University of Colorado Boulder, Boulder, CO 80309, USA; School of Pharmaceutical Sciences, Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Tsinghua University, Beijing 100082, China.

Cell Chemical Biology
|August 14, 2018
PubMed
Summary
This summary is machine-generated.

Researchers rationally designed potent small-molecule inhibitors for Toll-like receptor 8 (TLR8), a key target in autoimmune diseases. These novel compounds show high efficacy, offering therapeutic potential for treating autoimmune disorders.

Keywords:
TLR8antagonistsautoimmunityprotein-protein interactionsrational design

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Area of Science:

  • Chemical Biology
  • Immunology
  • Drug Discovery

Background:

  • Rational drug design targeting protein interfaces is challenging due to dynamic protein surfaces.
  • Toll-like receptor 8 (TLR8) overactivation is implicated in autoimmune disease pathogenesis.
  • Limited availability of small-molecule TLR8 antagonists necessitates new therapeutic strategies.

Purpose of the Study:

  • To rationally design and discover potent small-molecule antagonists for Toll-like receptor 8 (TLR8).
  • To validate the binding interactions of novel compounds with TLR8 using structural biology.
  • To evaluate the efficacy of identified TLR8 inhibitors in relevant biological systems.

Main Methods:

  • Utilized structural information of a small-molecule ligand complexed with TLR8 as a model system.
  • Employed rational design principles for small-molecule ligand discovery.
  • Determined X-ray crystallographic structures of ligand-protein complexes.
  • Conducted biological evaluations in cell lines and primary immune cells from human and transgenic mice.

Main Results:

  • Discovered six highly potent small-molecule compounds targeting TLR8 with approximately picomolar IC50 values.
  • X-ray crystallography confirmed specific contacts within the TLR8 binding pocket.
  • Demonstrated high efficacy of the identified TLR8 inhibitors in various cellular and ex vivo models.

Conclusions:

  • Successfully developed potent small-molecule TLR8 antagonists through rational design.
  • The discovered compounds exhibit significant therapeutic potential for autoimmune disorders.
  • Structural insights guided the design and validation of effective TLR8 inhibitors.