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Updated: Jun 10, 2025

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Precise Immobilization Strategy Combined with Rational Design to Improve β-Agarase Stability.

Xuewu Liu1,2,3, Xingfei Li1,2,3, Qiaoling Xie1,2,3

  • 1The State Key Laboratory of Food Science and Resources, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China.

Journal of Agricultural and Food Chemistry
|October 11, 2024
PubMed
Summary
This summary is machine-generated.

Enzyme immobilization using rational design and site-specific covalent attachment to magnetic nanoparticles enhances β-agarase stability and activity. This precise immobilization strategy improves thermal stability and tolerance to harsh conditions, aiding green manufacturing.

Keywords:
Michael addition reactionrational designsite-directed immobilizationstabilityβ-agarase

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Area of Science:

  • Biotechnology
  • Enzyme Engineering
  • Materials Science

Background:

  • Enzyme immobilization is crucial for industrial applications.
  • Precise control over enzyme orientation and activity is challenging.
  • Developing stable and active immobilized enzymes is essential for green manufacturing.

Purpose of the Study:

  • To develop a rational design strategy for site-specific covalent immobilization of β-agarase.
  • To enhance the stability and activity of immobilized β-agarase.
  • To explore the potential of immobilized enzymes in green manufacturing.

Main Methods:

  • Rational screening of surface sites for cysteine mutation using molecular dynamics and energy calculations.
  • Site-specific covalent immobilization via Michael addition reaction with maleimide-modified magnetic nanoparticles (MAL-MNPs).
  • Enzyme activity retention, thermal deactivation kinetics, and tolerance assays (metal ions, organic reagents).

Main Results:

  • Successfully achieved site-specific covalent immobilization of β-agarase onto MAL-MNPs.
  • Immobilized enzymes (R66C-MAL-MNPs, K588C-MAL-MNPs) showed >96% activity retention.
  • Significant improvement in thermal stability (21.25-fold increase in t1/2 at 40 °C) and enhanced tolerance to metal ions and 50% acetone/water solutions (>90% activity maintained).

Conclusions:

  • The developed rational design and site-specific immobilization strategy effectively enhances β-agarase stability and functionality.
  • This approach offers a robust method for creating highly stable and active immobilized enzymes.
  • The findings support the application of precisely immobilized enzymes in sustainable and green manufacturing processes.