Tubulin, the protein building block of the microtubules that act as a cell's internal railway tracks, can stop Tau and alpha synuclein from forming the toxic clumps associated with Alzheimer's and Parkinson's diseases. That finding, from a team at Baylor College of Medicine, appears in Nature Communications and points to a different way of thinking about these two notorious proteins: rather than blocking them, redirect them.
Tau and alpha synuclein have a double life. In disease, they misfold, stick together and form aggregates that damage neurons and contribute to memory loss and movement problems. In healthy neurons, the same proteins help maintain cell structure and support communication, interacting with tubulin and contributing to the assembly and stabilization of microtubules. As first author Dr. Lathan Lucas, a postdoctoral associate in Dr. Allan Ferreon's lab, put it, the proteins are essential as well as dangerous.
Both versions of that work happen inside tiny droplets called condensates, where the proteins concentrate to carry out their functions. Dissolving those droplets has been floated as a therapeutic strategy, but the approach carries an obvious risk: the droplets also serve normal neuronal purposes, so breaking them up could disrupt healthy brain function along with the harmful process. Ferreon, associate professor of biochemistry and molecular pharmacology and co-corresponding author, described the team's alternative as creating conditions inside the droplets that push the proteins down the healthy path instead of the disease path.
That reframing is the significance here. Instead of searching for a way to shut down a process that neurons genuinely need, the Baylor work suggests a molecular switch already present in the cell may be able to tip the balance. The findings come from laboratory work on protein behavior, and the distance between that and a treatment for patients remains considerable, but the strategy gives researchers a fresh target to pursue in two diseases that have resisted most attempts to slow them.