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Area of Science:

  • Molecular Biology
  • Immunology
  • Biophysics

Background:

  • Long double-stranded RNA (dsRNA) in the cytosol is recognized by MDA5, initiating the innate immune response.
  • Dysfunctional MDA5 ATPase activity is linked to severe pathological conditions.
  • MDA5 filament dynamics are implicated in dsRNA recognition, but the precise mechanism is unknown.

Purpose of the Study:

  • To investigate the mechanism of MDA5 filament assembly and dsRNA compaction at the single-molecule level.
  • To elucidate the role of ATP hydrolysis in MDA5-mediated dsRNA recognition.

Main Methods:

  • Utilized magnetic tweezers to monitor and manipulate single MDA5-dsRNA filaments.
  • Analyzed MDA5 filament assembly, dsRNA compaction, and the effect of ATP hydrolysis.

Main Results:

  • Observed cooperative, directional MDA5 filament assembly on dsRNA.
  • Demonstrated that MDA5 uses ATP hydrolysis to compact dsRNA into ssRNA against significant force.
  • Showed that ssRNA gaps impede compaction, suggesting a novel recognition mechanism.
  • Found that the compacted state is stabilized by MDA5 CARD oligomerization and requires high force to disrupt.

Conclusions:

  • MDA5 actively compacts dsRNA into ssRNA via ATP-dependent unwinding.
  • This compaction mechanism, influenced by ssRNA gaps, represents a new mode of dsRNA recognition.
  • MDA5-mediated dsRNA compaction likely serves to sequester viral RNA, inhibiting viral replication and contributing to innate immunity.