Mucins belong to the family of large glycoproteins that constitute the major structural component of mucus. Mucins execute wide range of physiological functions like protection and lubrication of epithelial surfaces, maintaining epithelial integrity, aiding in cell adhesion and confer protection against pathogens, toxins and foreign particles. MUC-17 protein maintains mucosal homeostasis, contributing to environmental stability. Interacting via its C-terminus, MUC-17 crucially associates with PDZK1, ensuring proper cellular localization.