TBC1D9B turns off ARL8B, lysosome placement
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- TBC1D9B identified as the GTPase‑activating protein that turns off ARL8B, the lysosomal transport switch.
- TMEM55B binds to TBC1D9B on the lysosomal membrane, enabling ARL8B inactivation.
- Lysosomes lose organized peripheral positioning and spread uncontrollably when TBC1D9B or TMEM55B is missing, especially under nutrient deprivation.
- Autophagy is impaired because lysosomes cannot relocate to the cell center without the TBC1D9B/TMEM55B regulator.
- The research team led by Markus Damme and Volker Haucke combined proteomics, genome editing, and high‑resolution microscopy to map lysosome positioning.
- Nature Communications published the findings in 2026, linking the mechanism to cancer, Alzheimer’s, Parkinson’s, and metabolic disorders.
Why it matters: The finding gives cancer researchers a concrete molecular target to modulate lysosome dynamics, potentially curbing tumor growth, while neuroscientists gain a lever to enhance neuronal resilience against neurodegeneration. It also suggests immune‑cell function could be tuned via the same pathway, offering a broader therapeutic angle.
