Biochemical characterization of MIF nuclease with a FRET-based quantitative 3' nuclease assay

Area of Science:

• Biochemistry
• Molecular Biology
• Enzymology

Background:

• Macrophage Migration Inhibitory Factor (MIF) is implicated in DNA replication and elevated in various cancers.
• MIF's role as a nuclease presents a potential therapeutic target for cancer treatment.

Purpose of the Study:

• To develop a quantitative assay for measuring MIF nuclease activity.
• To characterize the enzymatic properties of MIF, including cofactor requirements and modulators.
• To establish a platform for high-throughput screening of MIF inhibitors for anticancer drug development.

Main Methods:

• Development of a Förster Resonance Energy Transfer (FRET)-based quantitative nuclease assay.
• Assay designed to specifically measure the cleavage of 3' overhangs by MIF.
• Enzymatic characterization of MIF activity under varying conditions.

Main Results:

• Identification of Mg2+ as an essential cofactor for MIF activity, with optimal concentration at 10 mM.
• Discovery of a dual modulatory role of glucose on MIF enzymatic function.
• Demonstration of the assay's robustness for enzymatic characterization and inhibitor screening.

Conclusions:

• The developed FRET assay provides a robust method for quantifying MIF nuclease activity.
• Understanding MIF's enzymatic properties and cofactor requirements is crucial for drug development.
• This platform facilitates the discovery and advancement of novel anticancer therapeutics targeting MIF.