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IridiumIII Luminescent Probe for Detection of the Malarial Protein Biomarker Histidine Rich Protein-II

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Published on: July 7, 2015

ITC-based kinetics assay for NIS synthetases.

Katherine M Hoffmann¹, Jocelin D Hernandez¹, Eliana G Goncuian¹

¹Department of Chemistry, California Lutheran University, Thousand Oaks, CA, United States.

Methods in Enzymology

|August 18, 2024

Summary

This summary is machine-generated.

Researchers developed a novel, label-free assay for studying NIS Synthetases, crucial enzymes in virulence factor production. This new method using isothermal titration calorimetry offers a continuous readout for complex enzyme kinetics, advancing antibiotic research.

Keywords:

ITC Iterative enzymology Kinetics assay NIS synthetases

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Last Updated: Jun 16, 2025

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Published on: July 7, 2015

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Published on: August 17, 2019

Area of Science:

Biochemistry and enzymology
Microbial pathogenesis
Drug discovery

Background:

NIS Synthetases are essential enzymes for producing stealth siderophores, molecules linked to microbial virulence.
Existing kinetic assays for NIS Synthetases are limited by reporter molecules or indirect measurements, hindering research.
Studying these enzymes is vital for developing new antibiotics targeting virulence.

Purpose of the Study:

To develop a novel, label-free, continuous readout assay for NIS Synthetase kinetics.
To overcome limitations of existing assays and enable more accurate kinetic characterization.
To facilitate future studies on NIS Synthetase inhibition and biosynthesis applications.

Main Methods:

Utilized isothermal titration calorimetry (ITC) for a label-free kinetic assay.
Designed the assay for continuous monitoring of NIS Synthetase activity.
Validated the assay by distinguishing multiple substrate turnovers from single bond formation events.

Main Results:

Successfully implemented a label-free, continuous readout assay for NIS Synthetase systems.
The ITC-based assay accurately delineates complex enzyme kinetics, including iterative processes.
Demonstrated the assay's ability to differentiate single catalytic events from multiple turnovers.

Conclusions:

The developed ITC-based assay is the first label-free method for the NIS Synthetase field.
This assay provides a more robust platform for detailed kinetic comparisons of NIS Synthetases.
The method has potential broader applications for studying other iterative enzymes.