Redox-labile fluorescent probes and their surface immobilization methods for the detection of metabolites

Patent metadata

Field	Value
Publication number	US-12228568-B2
Application number	US-201917258427-A
Country	US
Kind code	B2
Filing date	Jul 8, 2019
Priority date	Jul 9, 2018
Publication date	Feb 18, 2025
Grant date	Feb 18, 2025

Abstract

Disclosed herein is an analytical method for profiling lactate (or other analyte) production in single cells, via the use of coupled enzyme reactions on surface-grafted resazurin/resorufin molecules is provided. Additionally surface-bound resazurin/resorufin that retains redox indicator activity as well as microfluidic devices comprising such surface-bound resazurin/resorufin indicators are provided.

First claim

What is claimed is:

1. A compound, which has a redox-active resazurin moiety, wherein said compound is selected from the group consisting of

wherein n is 2 to 24;

wherein j and k are independently 2-46; and

2. A composition comprising the compound according to claim 1 in an aqueous solution.

3. The composition according to claim 2 , further comprising nicotine adenine dinucleotide (NAD), nicotine adenine dinucleotide phosphate (NADP), or both.

4. The composition according to claim 2 , further comprising a diaphorase.

5. The composition according to claim 2 , further comprising a lactate dehydrogenase.

6. An assay device, which comprises a solid surface and the compound according to claim 1 immobilized on the solid surface.

7. The assay device according to claim 6 , wherein the compound is immobilized on the solid surface via a linker, wherein said linker comprises avidin, streptavidin, or a diarylcyclooctyne moiety.

8. The assay device according to claim 7 , wherein the linker further comprises a nucleic acid molecule.

9. The assay device according to claim 7 , wherein the diarylcyclooctyne moiety is dibenzylcyclooctyne (DBCO).

10. The assay device according to claim 8 , wherein the nucleic acid molecule is hybridized to a second nucleic acid molecule that is immobilized on the solid surface.

11. The assay device of claim 6 , wherein the solid surface is
a surface of a microfluidic device;
a surface of a microchannel or a microwell;
a surface of an elastomeric microfluidics device; or
a surface of a microchamber in a single cell barcode device.

12. The assay device of claim 11 , further comprising a lysis buffer reservoir.

13. The assay device of claim 12 , wherein a valve separates the lysis buffer reservoir from the microwell or the microchamber.

14. The assay device of claim 11 , wherein the microwell or the microchamber comprises a DNA barcode stripe.

15. A method of detecting and/or quantifying an analyte, which is reducible or oxidizable, in a single cell, which comprises
optionally lysing the single cell to obtain a lysate;
contacting the single cell or the lysate with the compound according to claim 1 in the presence of an NAD moiety, which is nicotine adenine dinucleotide (NAD) or nicotine adenine dinucleotide phosphate (NADP), and enzyme(s) that enzymatically couple the oxidation or reduction of the analyte with the oxidation or reduction of the redox-active moiety; and
detecting a change in fluorescence of the redox-active resazurin moiety, wherein said change in fluorescence indicates the presence of the analyte and the amount of fluorescence indicates the quantity of the analyte.

16. The method according to claim 15 , wherein the compound is immobilized on a solid surface of an assay device.

17. The method according to claim 16 , wherein the compound is immobilized on the solid surface via a linker which comprises avidin, streptavidin, or a diarylcyclooctyne moiety.

18. The method according to claim 17 , wherein the linker further comprises a nucleic acid molecule.

19. The method according to claim 17 , wherein the diarylcyclooctyne moiety is dibenzylcyclooctyne (DBCO).

20. The method according to claim 18 , wherein the nucleic acid molecule is hybridized to a second nucleic acid molecule that is immobilized on the solid surface.

21. The method according to claim 15 , wherein the enzymes comprise a diaphorase.

22. The method according to claim 15 , wherein the enzymes comprise a lactate dehydrogenase.

23. The method according to claim 15 , wherein the analyte is lactate, formate, glutamate, triacylglyceride, hydroxylglutarate, malate, fumarate, succinate, or citrate.

Assignees

• Univ California

Inventors

• Wei Wei
• Xue Min
• Li Zhonghan
• Cheng Hanjun

Classifications

• C12Q1/32

  involving dehydrogenase · CPC title

• C12Q1/26

  involving oxidoreductase · CPC title

• C09K2211/1018

  Heterocyclic compounds · CPC title

• C09K11/07

  having chemically-interreactive components, e.g. reactive chemiluminescent compositions · CPC title

• C09B62/78

  with other reactive groups · CPC title