YM201636

YM201636 is a potent and selective small molecule inhibitor of **1-phosphatidylinositol 3-phosphate 5-kinase (PIKfyve)**. Originally developed by Yamanouchi Pharmaceutical (now Astellas Pharma), it is widely utilized as a chemical probe to investigate endosomal trafficking and lysosomal function. By inhibiting PIKfyve, the compound prevents the synthesis of phosphatidylinositol 3,5-bisphosphate (PI(3,5)P2), which in turn triggers the nuclear translocation of **Transcription Factor EB (TFEB)**. This mechanism enhances lysosomal biogenesis and autophagy-mediated clearance of protein aggregates. Recent research has explored its potential in **Parkinson's disease** for the reduction of toxic alpha-synuclein aggregates, as well as its role in inhibiting viral entry (e.g., Ebola, SARS-CoV-2) by disrupting endosomal maturation.