Researchers have found that a tiny protein called TMEM175 works like an overflow drain inside our cells. This drain helps keep the inside of a small compartment, the lysosome, from becoming too acidic.
Lysosomes: The Cell’s Recycling Bin
Lysosomes are tiny bags wrapped in a membrane. They break down big molecules into smaller parts that the cell can use again. To do this, lysosomes need an acidic environment, which means they contain many protons (H⁺).
A pump pushes protons into the lysosome, making it acidic. But the cell also needs a way to stop the acid level from getting too low. TMEM175 acts as that safety valve.
What Happens When the Valve Fails?
When TMEM175 does not work properly, the lysosome’s acidity gets out of balance. Waste molecules then pile up instead of being broken down. This can cause nerve cells to die, which is linked to diseases like Parkinson’s.
Scientists think that fixing or supporting this valve could protect nerve cells and slow disease progression.
How TMEM175 Moves Ions
For a long time, scientists did not know where TMEM175 lived in the cell or what it moved. Some thought it only let potassium ions pass. New experiments showed that it moves both potassium and protons.
Using a technique called patch‑clamp, researchers measured the flow of ions across the lysosome membrane. They saw that TMEM175 can sense when the acidity becomes too high and then opens to let extra protons out.
These findings reveal that TMEM175 is a key part of the cell’s pH‑control system and give researchers a new target for therapies aimed at Parkinson’s disease.