PALS2 (protein associated with LIN7 2) is a membrane-associated guanylate kinase (MAGUK) protein that functions as a scaffolding molecule in cell-cell adhesion and polarity maintenance 1. The protein contains conserved protein interaction domains including PDZ, SH3, and guanylate kinase domains, and possesses a specialized mLin-7 binding domain that enables formation of heterotrimeric complexes with Lin-7 homologs 1. PALS2 localizes to lateral membranes in epithelial cells and facilitates multiple targeting complexes containing mLin-7 1. The protein demonstrates Ca2+-independent heterophilic cell-cell adhesion activity and can bind to neural cell adhesion molecules like Necl-1, contributing to synaptic organization and axon-glia interactions 2. Recent studies have identified PALS2's involvement in vascular smooth muscle cell apoptosis, where it forms complexes with GSDME and influences caspase-3 activation 3. Additionally, PALS2 expression is downregulated following acute aerobic exercise in skeletal muscle, suggesting roles in muscle adaptation and cellular organization 4. The protein represents a member of a MAGUK subfamily that enables diverse protein targeting complexes essential for maintaining cellular polarity in both epithelial and neural tissues.