Ionic liquids and protein folding-old tricks for new solvents

Area of Science:

• Biochemistry
• Green Chemistry
• Chemical Engineering

Background:

• Ionic liquids are increasingly used as solvents in enzymatic catalysis, aligning with green chemistry principles.
• Protein enzyme functionality critically depends on correct polypeptide chain folding into its native state.
• Assessing protein structure quantitatively is essential for understanding enzyme behavior.

Purpose of the Study:

• To outline parameters for empirical and model-based protein structure characterization.
• To identify factors influencing the interpretation of these parameters in non-aqueous solvents, specifically ionic liquids.
• To provide insights relevant to protein solubility and aggregation in industrial applications.

Main Methods:

• Review and discussion of existing characterization procedures for protein structure.
• Analysis of parameters used in empirical and model-based approaches.
• Examination of solvent effects, particularly when using ionic liquids instead of water.

Main Results:

• Different empirical and model-based characterization procedures yield distinct parameters for protein structure assessment.
• The choice of solvent significantly impacts the interpretation of these structural parameters.
• Factors affecting parameter interpretation in ionic liquids are highlighted.

Conclusions:

• Accurate interpretation of protein structure parameters is vital when employing ionic liquids in enzymatic catalysis.
• Understanding solvent-specific effects is key for reliable protein folding and function studies.
• This work translates and adapts key findings on protein solubility and aggregation for broader application.