Adaptor protein, phosphotyrosine interacting with PH domain and leucine zipper 1 (APPL1)

Adaptor protein, phosphotyrosine interacting with PH domain and leucine zipper 1 (APPL1) is a multifunctional endosomal adaptor protein characterized by BAR, PH, and PTB domains, enabling interaction with both proteins and many phosphoinositide lipids. Localized to Rab5-positive endosomes, APPL1 coordinates vesicular trafficking and integrates various cellular signaling events, including those in insulin, adiponectin, and growth factor pathways. APPL1 interacts with over 30 proteins, including AKT1/2, Rab5, DCC, EGFR, and several membrane receptors, regulating processes such as cell migration, adhesion, proliferation, and innate immunity. Loss or dysregulation of APPL1 is associated with enhanced cell migration, altered cellular adhesion turnover, and specific diseases including type 14 maturity-onset diabetes of the young (MODY14) and potentially cancer, through its modulation of receptor endocytosis and downstream kinase signaling[1][4][6][9][7].

Other names

DCC-interacting protein 13-alphaDIP13AKIAA1428Dip13-alphaMODY14APPLAdapter protein containing PH domain, PTB domain and leucine zipper motif 1AKT2 interactorsignaling adaptor protein DIP13alpha

Not classically targeted by drugs; functionally modulates signaling molecules such as AKT phosphorylation and activity, regulates endocytosis and receptor signaling (e.g., EGFR, insulin, adiponectin signaling)[4][7][1]