Issue 20, 2021

Mix-and-read bioluminescent copper detection platform using a caged coelenterazine analogue

Abstract

Serum copper levels are biomarkers for copper-related diseases. Quantification of levels of free copper (not bound to proteins) in serum is important for diagnosing Wilson's disease, in which the free copper concentration is elevated. Bioluminescence is commonly used in point-of-care diagnostics, but these assays require genetically engineered luciferase. Here, we developed a luciferase-independent copper detection platform. A luminogenic caged coelenterazine analogue (TPA-H1) was designed and synthesized to detect copper ions in human serum. TPA-H1 was developed by introducing a tris[(2-pyridyl)-methyl]amine (TPA) ligand, which is a Cu+ cleavable caging group, to the carbonyl group at the C-3 position of the imidazopyrazinone scaffold. The luciferin, named HuLumino1, is the product of the cleavage reaction of TPA-H1 with a copper ion and displays “turn-on” bioluminescence signals specifically with human serum albumin, which can be used to quantitatively analyse copper ions. TPA-H1 exhibited a fast cleavage of the protective group, high specificity, and high sensitivity for copper over other metal ions. This novel caged coelenterazine derivative, TPA-H1, can detect free copper ions in serum in a simple “mix-and-read” manner.

Graphical abstract: Mix-and-read bioluminescent copper detection platform using a caged coelenterazine analogue

Supplementary files

Article information

Article type
Paper
Submitted
19 Jul 2021
Accepted
25 Aug 2021
First published
27 Aug 2021

Analyst, 2021,146, 6139-6144

Mix-and-read bioluminescent copper detection platform using a caged coelenterazine analogue

R. Nishihara and R. Kurita, Analyst, 2021, 146, 6139 DOI: 10.1039/D1AN01292D

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