Modification of PEGylated enzyme with glutaraldehyde can enhance stability while avoiding intermolecular crosslinking

Area of Science:

• Biochemistry
• Enzyme Engineering
• Bioconjugation Chemistry

Background:

• Enzyme activity and stability are critical for biotechnological applications.
• Traditional enzyme stabilization methods can lead to aggregation and loss of function.
• Developing robust enzyme formulations is an ongoing challenge.

Purpose of the Study:

• To develop and evaluate a novel enzyme stabilization strategy.
• To assess the impact of PEGylation and glutaraldehyde modification on enzyme activity and stability.
• To prevent size increase and aggregation in modified enzymes.

Main Methods:

• PEGylation of a model enzyme.
• Controlled chemical modification of PEGylated enzyme with glutaraldehyde.
• Assessment of specific enzyme activity post-modification.
• Evaluation of enzyme stability at 37 °C over 4 weeks.

Main Results:

• PEGylated and glutaraldehyde-modified enzyme exhibited high specific activity immediately after synthesis (372.9 ± 20.68 U/mg).
• The modified enzyme retained 73% of its original activity after 4 weeks at 37 °C.
• The stabilization strategy successfully avoided size increases and aggregation.

Conclusions:

• PEGylation combined with glutaraldehyde modification is an effective strategy for enhancing enzyme stability.
• This approach preserves enzyme activity while preventing undesirable aggregation.
• The developed method offers a promising route for creating more robust enzyme formulations for various applications.