Stabilization of bovine trypsin by reductive methylation

Area of Science:

• Biochemistry
• Enzymology
• Protein Chemistry

Background:

• Bovine trypsin is a widely used protease in biochemical research and industrial applications.
• Autolysis, the self-degradation of trypsin, can limit its stability and efficacy.
• Controlling trypsin autolysis is crucial for maintaining its functional integrity.

Purpose of the Study:

• To investigate the effects of reductive methylation on the properties of bovine trypsin.
• To determine if reductive methylation can enhance the stability of trypsin against autolysis.
• To explore the potential utility of reductively methylated trypsin in applications where autolysis is problematic.

Main Methods:

• Bovine trypsin was subjected to reductive methylation.
• Catalytic activity and physicochemical properties of native and methylated trypsin were compared.
• Susceptibility of native and methylated trypsin to autolysis was assessed.
• Amino acid analysis was performed to identify modifications.

Main Results:

• Reductive methylation had minimal impact on the catalytic and physicochemical properties of bovine trypsin.
• Methylated trypsin exhibited significantly reduced susceptibility to autolysis compared to native trypsin.
• The increased stability was attributed to the conversion of trypsin-susceptible lysine residues to trypsin-resistant epsilon-N,N-dimethyllysine residues.
• Reductively methylated trypsin was readily prepared.

Conclusions:

• Reductive methylation is a viable method for enhancing the stability of bovine trypsin.
• The modified trypsin retains its essential properties while gaining resistance to autolysis.
• Reductively methylated trypsin offers a promising alternative for applications requiring prolonged enzyme activity and controlled autolysis.