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A coumarin-porphyrin FRET break-apart probe for heme oxygenase-1

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Title: A coumarin-porphyrin FRET break-apart probe for heme oxygenase-1
Authors: Walter, E
Ge, Y
Mason, J
Boyle, J
Long, N
Item Type: Journal Article
Abstract: Heme oxygenase-1 (HO-1) is a vital enzyme in humans that primarily regulates free heme concentrations. The overexpression of HO-1 is commonly associated with cardiovascular and neurodegenerative diseases including atherosclerosis and ischemic stroke. Currently, there are no known chemical probes to detect HO-1 activity, limiting its potential as an early diagnostic/prognostic marker in these serious diseases. Reported here are the design, synthesis, and photophysical and biological characterization of a coumarin–porphyrin FRET break-apart probe to detect HO-1 activity, Fe–L1. We designed Fe–L1 to “break-apart” upon HO-1-catalyzed porphyrin degradation, perturbing the efficient FRET mechanism from a coumarin donor to a porphyrin acceptor fluorophore. Analysis of HO-1 activity using Escherichia coli lysates overexpressing hHO-1 found that a 6-fold increase in emission intensity at 383 nm was observed following incubation with NADPH. The identities of the degradation products following catabolism were confirmed by MALDI-MS and LC–MS, showing that porphyrin catabolism was regioselective at the α-position. Finally, through the analysis of Fe–L2, we have shown that close structural analogues of heme are required to maintain HO-1 activity. It is anticipated that this work will act as a foundation to design and develop new probes for HO-1 activity in the future, moving toward applications of live fluorescent imaging.
Issue Date: 5-May-2021
Date of Acceptance: 30-Mar-2021
URI: http://hdl.handle.net/10044/1/89198
DOI: 10.1021/jacs.0c12864
ISSN: 0002-7863
Publisher: American Chemical Society
Start Page: 6460
End Page: 6469
Journal / Book Title: Journal of the American Chemical Society
Volume: 143
Issue: 17
Copyright Statement: © 2021 The Authors. Published by American Chemical Society. This is an open access article under a CC-BY Attribution Licence (https://creativecommons.org/licenses/by/4.0/)
Sponsor/Funder: British Heart Foundation
British Heart Foundation
British Heart Foundation
British Heart Foundation
Funder's Grant Number: PG/17/71/33242
Keywords: Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
03 Chemical Sciences
General Chemistry
Publication Status: Published
Online Publication Date: 2021-04-12
Appears in Collections:Chemistry
Catalysis and Advanced Materials
National Heart and Lung Institute
Faculty of Natural Sciences

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