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Monitoring Enzymatic Proteolysis Using Either Enzyme- or Substrate-Bioconjugated Quantum Dots.

S A Díaz¹, J C Breger¹, I L Medintz²

¹Center for Bio/Molecular Science and Engineering, Code 6900, U.S. Naval Research Laboratory, Washington, District of Columbia, USA; American Society for Engineering Education, Washington, District of Columbia, USA.

Methods in Enzymology

|April 27, 2016

Summary

This summary is machine-generated.

Developing new methods to measure enzyme kinetics in enzyme-nanoparticle hybrids is crucial. This study presents two novel assay techniques for quantifying enzyme activity in these complex constructs, enabling better understanding and optimization.

Keywords:

Assay Catalysis Enzyme FRET Fluorescence Kinetics Michaelis–Menten Proteases Quantum dot Spectrophotometry Substrate

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Area of Science:

Bioconjugation and Nanomaterials Science
Enzyme Kinetics and Biosensing

Background:

Enzyme-nanoparticle hybrids offer enhanced stability and sensitivity for sensing applications.
Quantitative kinetic analysis of these hybrids is challenging due to their unique properties influencing enzymatic assays.

Purpose of the Study:

To develop and compare two distinct assay methodologies for determining the kinetic activity of enzyme-nanoparticle constructs.
To provide deeper insights into the enzyme kinetics of these hybrids for further optimization.

Main Methods:

Utilized luminescent semiconductor nanocrystals (quantum dots, QDs) as the nanoparticulate platform.
Developed a fixed enzyme concentration/excess substrate assay for QD-enzyme constructs, analyzing initial velocities.
Developed a constant nanoparticle-substrate/increasing enzyme concentration assay for QD-substrate constructs, using a fluorescent ratiometric signal to follow the entire reaction progress curve.

Main Results:

Presented two distinct assay methodologies for enzyme-nanoparticle kinetic analysis.
Demonstrated the utility of quantum dots as a platform for these sensing formats.
Enabled comparison of enzyme kinetics between different QD-enzyme and QD-substrate constructs.

Conclusions:

The presented methodologies offer deeper insights into enzyme kinetics of hybrid constructs.
These assays facilitate the testing of individual variables for optimization of enzyme-nanoparticle systems.
This work advances the rational design and application of enzyme-nanoparticle hybrids.