Intriguingly, the SynGAP/PSD-95 assembly are stable droplets that behave like oil in the aqueous cytoplasm of cells in a phenomenon referred to as phase-transition. This could answer a long-standing mystery about the formation of PSDs. That oil-like behavior was disrupted, the researchers observed, when the SynGAP/PSD-95 proteins carry the mutations seen in autism cases.
"This study is only the beginning of teasing out how other proteins collectively contribute to the formation and brain activity-dependent alterations of PSD,” said Zhang. "We are also interested in trying to find out whether other synapses, the neuron/muscle connections for an example, also adopt the phase-transition strategy to build their PSDs".
Sources: Cell, AAAS/Eurekalert! via HKUST