| Here we report that KIF1Balpha , one of the two splice variants of KIF1B , directly interacts through its C terminal postsynaptic density 95 ( PSD 95 ) / discs large / zona occludens ( PDZ ) domain binding motif with PDZ proteins including PSD 95 / synapse associated protein 90 ( SAP 90 ) , SAP 97 , and synaptic scaffolding molecule ( S SCAM ) 90 ( SAP 90 ) . ^^^ |