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Fluorescence-Based Assay For Measuring OMA1 Activity.

Julia Tobacyk¹, Lee Ann MacMillan-Crow²

¹Department of Pharmacology and Toxicology, University of Arkansas for Medical Sciences, Little Rock, AR, USA.

Methods in Molecular Biology (Clifton, N.J.)

|June 1, 2021

Summary

We present an improved fluorescence assay to measure OMA1 protease activity, crucial for mitochondrial fusion. This method directly quantifies OMA1

Keywords:

Fluorescence-based reporter assay Fusion Mitochondria OMA1 Protease

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Area of Science:

Mitochondrial biology
Protease activity assays
Cellular dynamics

Background:

Mitochondrial fusion is vital for cellular function and relies on OPA1 processing.
OMA1, a mitochondrial metalloproteinase, regulates OPA1 cleavage.
Direct measurement of OMA1 enzymatic activity is essential for understanding its role.

Purpose of the Study:

To provide further insights and refinements to a previously developed OMA1 activity assay.
To enhance the direct measurement of OMA1 enzymatic activity in cellular contexts.

Main Methods:

Development of a fluorescence-based reporter assay.
Utilizing a specific OPA1 peptide sequence (S1 cleavage site) flanked by a fluorophore and quencher.
Application of the assay to whole cell lysates.

Main Results:

The assay allows for direct and sensitive detection of OMA1 proteolytic activity.
The reporter system quantifies OMA1's cleavage of the OPA1 S1 site.
This method offers a valuable tool for studying OMA1 regulation.

Conclusions:

The refined OMA1 activity assay provides a robust method for studying mitochondrial dynamics.
This assay facilitates research into OMA1 function and its regulation in cellular processes.