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Updated: Apr 1, 2026

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

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

Published on: January 16, 2019

Activity profiling of aminopeptidases in cell lysates using a fluorogenic substrate library.

Anna Byzia¹, Agata Szeffler², Leszek Kalinowski²

¹Division of Bioorganic Chemistry, Faculty of Chemistry, Wroclaw University of Technology, 50-370 Wroclaw, Poland.

|October 10, 2015

Summary

Fluorogenic substrates effectively measure aminopeptidase N (APN) activity in cell lysates. This library fingerprinting method distinguishes specific aminopeptidases, aiding disease biomarker discovery.

Keywords:

Aminopeptidase CD13 Exopeptidase Fluorogenic substrate Protease

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Area of Science:

Biochemistry
Enzymology
Molecular Biology

Background:

Aminopeptidases are crucial exopeptidases regulating metabolic pathways.
Their role in diseases like cancer and rheumatoid arthritis makes them valuable biomarkers.

Purpose of the Study:

To develop and validate a fluorogenic substrate library for measuring aminopeptidase N (APN) activity.
To assess APN activity in cell lysates from human, pig, and rat kidneys.
To compare substrate specificity profiles of cell lysates with isolated APN.

Main Methods:

Utilized a library of fluorogenic substrates with natural and unnatural amino acids.
Measured APN activity in kidney cell lysates.
Compared enzyme activity profiles to known substrate specificities of isolated APN.

Main Results:

Fluorogenic substrates reliably identified and quantified aminopeptidase activity in cell lysates.
The library fingerprinting approach provided specific enzyme information, unlike single-substrate assays.
Data supported the efficacy of this method for APN activity assessment across species.

Conclusions:

Fluorogenic substrate libraries are effective tools for aminopeptidase activity measurement in complex biological samples.
This method offers superior enzyme specificity compared to traditional assays.
Potential applications include biomarker discovery and understanding enzyme roles in disease.