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Magneto-Controlled Enzyme Activity with Locally Produced pH Changes.

Krisztina Szekeres1,2, Paolo Bollella1,3, Yongwook Kim4

  • 1Department of Chemistry and Biomolecular Science, Clarkson University, 8 Clarkson Avenue, Potsdam, New York 13699, United States.

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Magnetic fields dynamically control enzyme activity. Superparamagnetic nanoparticles functionalized with urease or esterase enzymes enable reversible activation/inhibition of immobilized amyloglucosidase (AMG) through localized pH changes.

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Area of Science:

  • Biochemistry
  • Materials Science
  • Enzyme Engineering

Background:

  • Enzyme immobilization enhances stability and reusability.
  • Controlling enzyme activity in response to external stimuli is crucial for biocatalysis.
  • Superparamagnetic nanoparticles offer unique magnetic manipulation capabilities.

Purpose of the Study:

  • To develop a magnetically controlled biocatalytic system.
  • To investigate the dynamic and reversible modulation of amyloglucosidase (AMG) activity.
  • To explore the use of enzyme-functionalized magnetic nanoparticles for activity control.

Main Methods:

  • Immobilization of amyloglucosidase (AMG) onto superparamagnetic nanoparticles.
  • Functionalization of magnetic nanoparticles with urease or esterase enzymes.
  • Application of an external magnetic field to induce particle aggregation/deaggregation.
  • Monitoring of AMG activity in response to magnetic field application and resulting local pH changes.

Main Results:

  • The biocatalytic activity of immobilized AMG was successfully modulated by an external magnetic field.
  • Magnetic field application led to reversible activation and inhibition of AMG.
  • The observed activity changes correlated with local pH shifts induced by co-immobilized urease/esterase enzymes.
  • Particle aggregation/deaggregation dynamics were linked to enzyme activity modulation.

Conclusions:

  • A novel magnetically responsive biocatalytic system was demonstrated.
  • Enzyme-functionalized magnetic nanoparticles provide a platform for remote control of enzyme activity.
  • This approach offers precise and reversible regulation of biocatalysis through localized pH changes induced by magnetic fields.