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Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

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A new naphthalene-based fluorogenic substrate for cytochrome P450 4A11.

Dmitri R Davydov¹, Kannapiran Ponraj¹, Nadezhda Davydova¹

¹Department of Chemistry, Washington State University, Pullman, WA 99164, U.S.A.

The Biochemical Journal

|June 2, 2025

Summary

This summary is machine-generated.

Researchers developed a new fluorimetric assay using 3-(6-methoxynaphthalen-2-yl)acrylic acid (MONACRA) to measure the activity of CYP4A11, the main enzyme producing 20-HETE. This assay is specific for CYP4A11 in human liver microsomes.

Keywords:

3-(6-methoxynaphthalen-2-yl)acrylic acid CYP1A2 CYP4A11 fluorogenic substrates high-throughput activity assay human liver microsomes

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Area of Science:

Biochemistry
Enzymology
Drug Metabolism

Background:

Cytochrome P450 enzymes, particularly CYP4A11, play crucial roles in metabolizing various compounds.
CYP4A11 is the primary enzyme responsible for producing 20-hydroxyeicosatetraenoic acid (20-HETE), a key signaling molecule.
Accurate and sensitive assays are needed to study CYP4A11 activity and its involvement in physiological and pathological processes.

Purpose of the Study:

To develop a high-throughput fluorimetric assay for quantifying CYP4A11 activity.
To identify and validate a suitable fluorogenic substrate for CYP4A11.
To utilize the developed assay to assess CYP4A11 activity in human liver microsomes.

Main Methods:

Investigated 3-(6-methoxynaphthalen-2-yl)acrylic acid (MONACRA) as a potential substrate for CYP4A11.
Studied MONACRA metabolism using human liver microsomes (HLM) and recombinant P450 enzymes.
Developed and optimized a fluorimetric assay based on the O-demethylation of MONACRA to 3-(6-hydroxynaphthalen-2-yl)acrylic acid.

Main Results:

MONACRA was identified as a substrate for CYP4A11, yielding a fluorescent product.
Recombinant CYP4A11 exhibited Michaelis-Menten kinetics with a KM of 189±37 μM and kcat of 67±18 min-1.
While recombinant CYP1A2 also metabolized MONACRA, inhibitor studies confirmed CYP4A11 as the sole enzyme responsible in HLM.
The assay demonstrated a strong correlation between MONACRA metabolism rates and CYP4A11 content in HLM.

Conclusions:

3-(6-methoxynaphthalen-2-yl)acrylic acid (MONACRA) is a specific and sensitive fluorogenic substrate for CYP4A11.
A robust, automated fluorimetric assay for CYP4A11 activity has been successfully developed.
The assay provides a reliable tool for quantifying CYP4A11 activity and assessing its contribution in biological samples.