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Monolayer-controlled substrate selectivity using noncovalent enzyme-nanoparticle conjugates.

Rui Hong1, Todd Emrick, Vincent M Rotello

  • 1Department of Chemistry, University of Massachusetts Amherst, Amherst, Massachusetts 01003, USA.

Journal of the American Chemical Society
|October 21, 2004
PubMed
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Chymotrypsin was conjugated to gold nanoparticles using electrostatic interactions. This altered enzyme selectivity, inhibiting anionic substrate hydrolysis while sparing cationic ones.

Area of Science:

  • Bioconjugation
  • Nanoparticle-protein interactions
  • Enzyme kinetics

Background:

  • Chymotrypsin is a key serine protease.
  • Nanoparticle-protein conjugates offer unique applications.
  • Controlling enzyme activity at surfaces is challenging.

Purpose of the Study:

  • To investigate the effect of noncovalent conjugation on chymotrypsin's substrate selectivity.
  • To explore the use of electrostatic interactions for enzyme immobilization.
  • To characterize the altered hydrolysis activity of immobilized chymotrypsin.

Main Methods:

  • Noncovalent conjugation of chymotrypsin to gold nanoparticles.
  • Utilizing hybrid tetraethylene(glycol)alkanethiol monolayers with carboxylate termini.
  • Assessing enzyme activity using anionic and cationic substrates.

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Main Results:

  • Successful electrostatic conjugation of chymotrypsin to functionalized gold nanoparticles.
  • Significant alteration in substrate selectivity of the immobilized enzyme.
  • Inhibition of anionic substrate hydrolysis.
  • Unchanged hydrolysis rate for cationic analogues.

Conclusions:

  • Electrostatic conjugation provides a method to tune enzyme selectivity.
  • Gold nanoparticle-based immobilization can modulate chymotrypsin activity.
  • This approach offers potential for enzyme-based sensors and biocatalysis.