Modeling stability and flexibility of α-Chymotrypsin in room temperature ionic liquids

Area of Science:

• Biochemistry
• Materials Science
• Computational Chemistry

Background:

• Enzyme stability and activity are crucial for biocatalysis.
• Room temperature ionic liquids (RTILs) offer unique solvation properties for biomolecules.
• Understanding enzyme behavior in RTILs is key to developing novel enzymatic applications.

Purpose of the Study:

• To investigate the structural dynamics of α-Chymotrypsin in various RTILs with different water concentrations.
• To correlate molecular dynamics simulations with experimental enzyme activity data.
• To elucidate the role of water and ionic liquid components in enzyme solvation and stability.

Main Methods:

• Molecular dynamics simulations of α-Chymotrypsin in five different RTILs.
• Analysis of protein structural properties, including native-like structure and main chain fluctuations.
• Assessment of water content effects (w/w) on enzyme solvation and flexibility.

Main Results:

• α-Chymotrypsin structure remained more native-like in RTILs compared to aqueous solutions.
• Optimal protein structure was observed at 10-20% water (w/w) in most RTILs, except [BMIM][Cl].
• Water concentration significantly influenced enzyme flexibility, with flexible regions being more hydrated. [BMIM][Cl] caused destabilization due to ion penetration.

Conclusions:

• RTILs can provide a stabilizing environment for enzymes like α-Chymotrypsin.
• Water plays a critical role in modulating enzyme flexibility and solvation within RTILs.
• The choice of RTIL and water content are critical factors for maintaining enzyme structure and function.