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Self-association of mucin
1Department of Physics, Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. cpbrolev@msn.com
Biomacromolecules
|November 17, 2001
Summary
Human tracheobronchial mucin forms viscoelastic gels below 30°C. Above this temperature, mucin undergoes a gel-sol transition due to hydrophobic aggregation, altering solution properties.
Area of Science:
- Biophysics
- Materials Science
- Biochemistry
Background:
- Human tracheobronchial mucin is a key component of mucus, crucial for respiratory health.
- Understanding mucin's aggregation behavior is vital for respiratory disease research and therapeutic development.
Purpose of the Study:
- To investigate the aggregation phenomena in purified human tracheobronchial mucin solutions.
- To characterize the physical and chemical changes associated with mucin aggregation and gel-sol transitions.
Main Methods:
- Rheological measurements to assess viscoelastic properties.
- Steady-state fluorescence and quasielastic light scattering (QELS) to probe molecular aggregation and microenvironment changes.
- Spin probe techniques (ESR) to analyze aggregate-aqueous interfaces.
Main Results:
- Mucin solutions form viscoelastic gels below 30°C at concentrations above 15 mg/mL.
- A reversible gel-sol transition occurs above 30°C, indicated by changes in rheological parameters.
- QELS and fluorescence data suggest aggregation of hydrophobic protein segments at 37°C, leading to increased hydrophobicity.
- ESR studies reveal a more developed aggregate-aqueous interface at elevated temperatures.
Conclusions:
- Human tracheobronchial mucin undergoes a thermally induced, reversible gel-sol transition driven by hydrophobic aggregation of protein segments.
- These findings provide insights into the physical behavior of mucin and its potential role in respiratory conditions.