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Area of Science:

  • Molecular Biology
  • Immunology
  • Biochemistry

Background:

  • Cyclic nucleotide signaling is crucial for antiviral defense across all life forms.
  • Bacterial systems, like the Toll/interleukin-1 receptor (TIR) domain, employ cyclic nucleotides for defense, often degrading essential biomolecules such as NAD+.

Purpose of the Study:

  • To elucidate the mechanism of a bacterial antiviral defense system involving cyclic nucleotide signaling.
  • To investigate the role of cyclic tri-adenylate in the activation of TIR effector proteins and NAD+ degradation.

Main Methods:

  • In vitro and in vivo experiments were used to study the molecular assembly and activation process.
  • Structural analysis focused on the interaction between cyclic tri-adenylate, TIR-SAVED effectors, and the formation of superhelical solenoid structures.

Main Results:

  • A bacterial antiviral system generates cyclic tri-adenylate, which binds to a TIR-SAVED effector.
  • This binding facilitates the assembly of an extended superhelical solenoid structure, organizing composite active sites for NAD+ degradation.
  • Activation of this defense mechanism requires the formation of extended filaments, observed both in vitro and in vivo.

Conclusions:

  • The study demonstrates large-scale molecular assembly controlled by cyclic nucleotides in a bacterial antiviral defense system.
  • Key mechanistic details of TIR enzyme activation, involving filament formation and NAD+ degradation, have been revealed.