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Area of Science:

  • Immunology
  • Structural Biology
  • Virology

Background:

  • Toll-like receptor 3 (TLR3) is crucial for innate immunity, recognizing viral double-stranded RNA (dsRNA).
  • Previous studies indicated a minimum dsRNA length of 40-50 base pairs for TLR3 binding and dimerization.
  • The mechanism of efficient TLR3 activation by longer dsRNA remained unclear.

Purpose of the Study:

  • To elucidate the molecular mechanism of dsRNA length-dependent TLR3 activation.
  • To investigate the structural basis for efficient TLR3 signaling.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) was used to analyze TLR3 complexed with longer dsRNA.
  • Structural analysis of TLR3-dsRNA interactions.

Main Results:

  • TLR3 dimers laterally assemble into higher-order multimeric complexes along longer dsRNA.
  • This higher-order complex formation provides a basis for cooperative binding.
  • Efficient signal transduction is achieved through this multimeric assembly.

Conclusions:

  • Longer dsRNA promotes the formation of higher-order TLR3 complexes.
  • This cooperative binding mechanism underlies efficient TLR3 activation and signal transduction.
  • The findings provide structural insights into TLR3's length-dependent recognition of viral RNA.