What is the mechanism of action of the agent referred to as "collided"?

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Recommendation: Define “collided” as collided ribosomes; mechanism centers on collision-sensing that triggers stress signaling and mRNA quality control

  • Bold Recommendation

    • “Collided” refers to collided ribosomes (disomes/trisomes) whose mechanism of action is to act as a sentinel scaffold that activates ZAK-mediated SAPK (p38/JNK) and GCN2 stress signaling, stalls/attenuates translation, and promotes mRNA quality control and decay. 1

  • Algorithmic mechanism (prioritizing most recent, highest-quality evidence affecting morbidity, mortality, QOL)

    1. Collision formation
      • Translational stalls (e.g., elongation slowdowns, nutrient stress, UV) cause trailing ribosomes to rear-end leading ribosomes, forming collided units (disomes; higher-order polysome compression) 2.
    2. Collision sensing and signal transduction
      • MAPKKK ZAK binds elongating ribosomes but specifically auto-phosphorylates on disomes, triggering immediate early activation of p38/JNK (SAPK) and GCN2 pathways, modulating cell fate under stress (apoptosis, survival programs) 1.
    3. Translation attenuation and quality control
      • GCN2 activation reduces initiation; structural studies show expanded collision interfaces (40S, L1 stalk, eEF2) consistent with translocation inhibition and accumulation of tRNA-bound 80S/60S states, reorganizing translation during persistent stress 2.
    4. mRNA surveillance/decay linkage
      • Collisions arising from m6A-induced stalls recruit m6A readers (YTHDF), accelerating targeted mRNA degradation; stabilizing conditions that reduce collisions preserve m6A-mRNAs during stress 3.
    5. Context and duration matter
      • Endogenous collisions are widespread; detection and downstream pathway engagement depend on stall severity and persistence, determining whether cells execute repair, reprogramming, or death pathways 4.

  • Nuances, pitfalls, caveats

    • “Collision” also occurs in transcription (RNAP-RNAP), but that is a

References

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