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Airway Mucus Disulfide Bonds
- Molecular classification
- Post-translational modification, Covalent bond
01
Overview
Airway mucus disulfide bonds are covalent linkages formed between cysteine residues on mucin glycoproteins, primarily MUC5AC and MUC5B. These bonds are critical for the viscoelastic properties of mucus, enabling pathogen trapping and mucociliary clearance. Pathological increase in disulfide cross-linking, driven by oxidative stress, contributes to muco-obstructive lung diseases. Therapeutic targeting aims to reduce these bonds to decrease mucus viscosity, but selectivity is crucial to avoid disrupting normal host defense mechanisms.
- Other names
- Mucin disulfide bondsAirway mucus cross-linkingMUC5AC disulfide bondsMUC5B disulfide bonds
02
Mechanism of action
Disruption of disulfide bonds, decreasing mucus viscosity and elasticity
03
Biological functions
Mucus viscoelasticityPathogen trappingMucociliary clearanceAirway protection
04
Disease associations
AsthmaCOPDCystic FibrosisMuco-obstructive lung diseases
05
Safety considerations
Impaired normal ciliary clearanceOff-target effects on other proteins with essential disulfide bondsExcessive reduction leading to mucus instability
06
Interacting drugs
Mucolytics (e.g., N-acetylcysteine)
1 more in the full profile.
07
Biomarkers
Mucus viscosityMucus elasticityDisulfide bond density
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