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Use of Recombinant Fusion Proteins in a Fluorescent Protease Assay Platform and Their In-gel Renaturation

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Sensitive Versatile Fluorogenic Transmembrane Peptide Substrates for Rhomboid Intramembrane Proteases.

Anežka Tichá^1,2, Stancho Stanchev¹, Jan Škerle^1,3

¹From the Institute of Organic Chemistry and Biochemistry of the Czech Academy of Science, Flemingovo n. 2, Prague 166 10.

The Journal of Biological Chemistry

|January 11, 2017

Summary

This summary is machine-generated.

Researchers developed novel fluorogenic substrates for rhomboid proteases, enabling high-throughput screening for potent drug inhibitors. These transmembrane peptide substrates are crucial for advancing rhomboid protease drug discovery.

Keywords:

enzyme kinetics enzyme mechanism fluorescence resonance energy transfer (FRET)intramembrane proteolysis membrane reconstitution rhomboid protease substrate specificity transmembrane domain

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Area of Science:

Biochemistry
Molecular Biology
Drug Discovery

Background:

Rhomboid proteases are critical drug targets, but their study is limited by a lack of effective in vitro assays.
Developing specific inhibitors for rhomboid proteases is challenging due to assay limitations.

Purpose of the Study:

To develop novel, versatile fluorogenic transmembrane peptide substrates for rhomboid proteases.
To facilitate high-throughput screening (HTS) for rhomboid protease inhibitors.

Main Methods:

Design and synthesis of red-shifted fluorogenic transmembrane peptide substrates.
Testing substrate cleavage by various rhomboid proteases in detergent micelles and liposomes.
Investigating the impact of substrate sequence and detergent concentration on cleavage rates.

Main Results:

Developed substrates cleaved by multiple rhomboid proteases in both micelles and liposomes.
Demonstrated the importance of the entire transmembrane domain for efficient substrate cleavage.
Showed that cleavage rates in micelles are detergent concentration-dependent.
Identified sequence modifications (P5-P1 region) that enhance catalytic efficiency and selectivity.

Conclusions:

The novel fluorogenic substrates are suitable for HTS and inhibitor development for rhomboid proteases.
Understanding substrate-enzyme interactions is key to improving rhomboid protease inhibitor design.
These substrates provide a versatile tool for studying intramembrane proteolysis and advancing drug discovery efforts.