The functional and structural stabilization of trypsin by sucrose

Area of Science:

• Biochemistry
• Protein Stabilization
• Enzyme Dynamics

Background:

• Trypsin is a crucial digestive enzyme whose stability is vital for its function.
• Understanding how stabilizing agents like sucrose interact with enzymes is key to protein engineering and therapeutic applications.

Purpose of the Study:

• To investigate the stabilizing effects of sucrose on trypsin's structure, dynamics, and activity.
• To elucidate the molecular mechanisms underlying sucrose-induced stabilization of trypsin.

Main Methods:

• Thermal stability studies (measuring melting temperature, enthalpy, and entropy changes).
• Spectroscopic techniques including fluorescence, absorption, and circular dichroism.
• Molecular docking simulations.

Main Results:

• Sucrose significantly enhanced trypsin stability and activity, increasing its melting temperature (Tm).
• Spectroscopic analysis confirmed sucrose protects trypsin's native conformation, preventing unfolding.
• Molecular docking revealed indirect interactions via preferential hydration, rather than direct hydrogen bonds, are primary for stabilization.

Conclusions:

• Sucrose stabilizes trypsin primarily through indirect mechanisms involving preferential hydration.
• The enzyme-activity parameter (kcat/Km) increased upon sucrose conjugation.
• Sucrose exclusion from the trypsin surface, driven by water's favorable interactions, underlies the observed stabilization.