Application of recent advances in hydrodynamic methods for characterising mucins in solution

Area of Science:

• Biochemistry
• Biophysics
• Materials Science

Background:

• Mucins are essential macromolecules in mucus, acting as natural lubricants.
• Mucins are heterogeneous and poorly characterized, limiting understanding of their properties.
• Hydrodynamic methods offer new possibilities for studying mucin solution behavior.

Purpose of the Study:

• To investigate the heterogeneity and conformational flexibility of porcine intestinal mucin (PIM).
• To apply advanced hydrodynamic techniques for a detailed characterization of PIM.
• To quantify the molar mass and structural parameters of MUC2 mucin.

Main Methods:

• Sedimentation equilibrium using the SEDFIT-MSTAR algorithm.
• Size exclusion chromatography coupled with multi-angle light scattering (SEC-MALS).
• On-line differential pressure viscometry and sedimentation velocity analysis.
• Global conformation analysis using the HYDFIT algorithm.

Main Results:

• Determined a weight-average molar mass of approximately 7.1-7.2 × 10(6) g mol(-1) for PIM.
• Sedimentation velocity revealed significant polydispersity, consistent with SEC-MALS data.
• Analysis indicated a flexible linear structure for PIM with specific persistence length and mass per unit length.

Conclusions:

• Porcine intestinal mucin (MUC2) exhibits a flexible linear conformation.
• Hydrodynamic methods provide robust characterization of mucin heterogeneity and structure.
• This research enhances the understanding of mucin's role as a biological lubricant.