Mucin–mucin self-interface

The mucin–mucin self-interface refers to the biochemical and physical contact points between individual mucin glycoproteins, primarily MUC5AC and MUC5B, which facilitate the formation of a complex, viscoelastic gel network (Thornton et al., 2008). This interface is maintained through a combination of covalent disulfide bonds between cysteine-rich D-domains and various non-covalent interactions, including hydrophobic and electrostatic forces (Fahy & Dickey, 2010). In healthy individuals, this gel-forming process is essential for mucociliary clearance and protecting the underlying epithelium from pathogens and irritants (Boucher, 2019). However, in respiratory diseases such as cystic fibrosis and COPD, hyper-polymerization or dehydration leads to pathologically thick mucus that obstructs airways (Ridley et al., 2014). Therapeutic strategies targeting this interface aim to disrupt these interactions using mucolytic agents, such as thiol-based reducers, to decrease mucus viscosity and enhance clearance (Henke, 2010). By breaking the bonds at the self-interface, these drugs help restore normal airway patency and reduce the risk of chronic infection and inflammation (Ehre et al., 2019).

Other names

Mucin polymerization interfaceMucin-mucin interaction siteMucin gel-forming complexMucin cross-linking interface

Reduction of intermolecular disulfide bonds and disruption of non-covalent interactions between mucin monomers to decrease mucus viscosity (Henke, 2010; Boucher, 2019).