Protein disulfide bonds in mucin

Protein disulfide bonds in mucin and other glycoproteins are critical structural elements that maintain the three-dimensional architecture and viscoelastic properties of mucus (Source: PubMed, PMID: 25100604). Mucins, such as MUC5AC and MUC5B, are large, heavily glycosylated proteins that polymerize through the formation of intermolecular disulfide bonds between cysteine-rich domains (Source: UniProt). In diseases characterized by mucus hypersecretion and stasis, such as cystic fibrosis and chronic obstructive pulmonary disease (COPD), these bonds contribute to the formation of thick, obstructive mucus plugs (Source: NIH, National Heart, Lung, and Blood Institute). Therapeutic intervention often involves the use of mucolytic agents, such as N-acetylcysteine, which act as reducing agents to break these disulfide bridges (Source: PubChem, CID 12035). By converting the disulfide bonds into free sulfhydryl groups, these drugs decrease the molecular weight and viscosity of the mucin polymers, facilitating easier clearance from the airways (Source: StatPearls, 'Mucolytics'). Beyond the respiratory tract, these bonds are also relevant in the gastrointestinal and ocular systems where mucus serves as a protective barrier (Source: Wikipedia, 'Mucin').

Other names

Mucin disulfide bridgesCystine bonds in glycoproteinsMucus cross-linksIntermolecular disulfide bonds in mucinDisulfide bonds in mucin and other glycoproteins

Reduction of disulfide bonds to free sulfhydryl groups, leading to the depolymerization of mucin networks and reduction of mucus viscosity.