Host mucin glycoprotein (None broadly standardized; individual mucins may use abbreviations such as MUC2, MUC5AC, MUC5B, etc.[3][4][7])

Host mucin glycoproteins are a family of high molecular weight, highly glycosylated proteins produced by epithelial cells throughout the body. They constitute the primary structural component of mucus, secreted at mucosal surfaces such as the respiratory, gastrointestinal, and urogenital tracts. Mucins possess a protein backbone rich in proline, threonine, and serine that is densely O-glycosylated, often accounting for up to 80% of their mass. This glycosylation confers hydrophilicity, gel-forming properties, and a dynamic capacity to modulate interactions with microbes, exclude pathogens, lubricate tissues, and organize microbial communities. The mucin gene family includes at least 21 members in humans, with subtypes divided into gel-forming (e.g., MUC2, MUC5AC, MUC5B), secreted non-gel-forming, and membrane-bound classes (e.g., MUC1, MUC4). Pathological changes in mucin expression or structure are implicated in cancer, infection, inflammatory diseases, and mucus-overproduction disorders. Mucin glycoproteins are not direct pharmacological targets, but their modulation or mimicry is of growing biomedical interest[3][4][7][1][2][5][6].

Other names

MucinsMucin-type glycoproteinsGel-forming mucins (e.g., MUC2, MUC5AC, MUC5B, MUC6, MUC19)Membrane-bound mucins (e.g., MUC1, MUC4)

Mucolytics: Reduce viscosity and aid clearance by breaking disulfide bonds (N-acetylcysteine) or DNA in mucus (Dornase alfa)[2][7] Pathogen enzymes: Cleave mucin glycan or protein backbone to facilitate infection[6] Mucin mimetics: Attempt to replicate barrier functions for bioengineering or therapy[3]