Mucin glycoprotein (None routinely used for the family)

Mucin glycoproteins are a large family of secreted and membrane-bound proteins, characterized by extensive O-glycosylation and tandem repeat protein domains. Disulfide bonds formed between cysteine-rich domains at the N- and C-termini are essential for polymerization of secreted gel-forming mucins (such as MUC2, MUC5B) and assembly of the mucus barrier[4][5][9]. These covalent linkages stabilize the mucus matrix, contributing to its viscoelastic properties and resistance to proteolysis in harsh environments like the intestine[4][9]. Alterations in mucin structure and disulfide bonding are implicated in several diseases, most notably cancer and chronic inflammation[5][10]. Disulfide bonding in mucins is vital for their supramolecular assembly, especially in the low pH environment of the Golgi during biosynthesis[9]. Therapeutic disruption of these bonds, typically by mucolytic agents, risks weakening the protective mucus barrier against pathogens and toxins[3][9]. In summary, "mucin glycoprotein disulfide bonds" describe the covalent linkages within mucin glycoproteins, a structural feature rather than a discrete therapeutic target[9].

Other names

Mucinsmucus glycoproteinsgel-forming mucinssecretory mucins

Not applicable for this entry; for mucin glycoproteins generally, mechanisms may include mucolytics that disrupt disulfide bonds (e.g., N-acetylcysteine, used as a mucolytic in respiratory disease)