Photon reducing agents for use in fluorescence assays
First Claim
1. A method of identifying a chemical with a biological activity, comprising:
- a) contacting a sample with a test chemical, said sample comprising a target, b) contacting said sample with at least one photon reducing agent, wherein said sample comprises a membrane compartment in contact with a solid surface, wherein said membrane compartment includes at least one photon producing agent that directly or indirectly monitors the activity of said target and said at least one photon reducing agent is in an aqueous solution that contacts the outer surface of said membrane compartment, and wherein said at least one photon reducing agent has an absorption spectra that overlaps with the absorption, emission or excitation spectrum of said at least one photon producing agent or wherein said at least one photon producing agent exhibits fluorescence resonance energy transfer with said at least one photon reducing agent, wherein said at least one photon reducing agent is substantially impermeant to said membrane compartment, wherein said at least one photon reducing agent does not specifically bind to said membrane compartment, and wherein said at least one photon reducing agent is present in said aqueous solution at a concentration sufficient to reduce light emitted from said aqueous solution by at least 10% compared to the light emitted of said aqueous solution in the absence of said at least one photon reducing agent, c) detecting an optical signal from said at least one photon producing agent, d) comparing the optical signal from said at least one photon producing agent to a background or control optical signal from a control sample.
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Abstract
The present invention provides a method for reducing undesirable light emission from a sample using at least one photon producing agent and at least one photon reducing agent (e.g. dye-based photon reducing agents). The present invention further provides a method for reducing undesirable light emission from a sample (e.g., a biochemical or cellular sample) with at least one photon producing agent and at least one collisional quencher. The present invention also provides a method for reducing undesirable light emission from a sample (e.g., a biochemical or cellular sample) with at least one photon producing agent and at least one quencher, such as an electronic quencher. The present invention also provides a system and method of screening test chemicals in fluorescent assays using photon reducing agents. The present invention also provides compositions, pharmaceutical compositions, and kits for practicing these methods.
107 Citations
31 Claims
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1. A method of identifying a chemical with a biological activity, comprising:
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a) contacting a sample with a test chemical, said sample comprising a target, b) contacting said sample with at least one photon reducing agent, wherein said sample comprises a membrane compartment in contact with a solid surface, wherein said membrane compartment includes at least one photon producing agent that directly or indirectly monitors the activity of said target and said at least one photon reducing agent is in an aqueous solution that contacts the outer surface of said membrane compartment, and wherein said at least one photon reducing agent has an absorption spectra that overlaps with the absorption, emission or excitation spectrum of said at least one photon producing agent or wherein said at least one photon producing agent exhibits fluorescence resonance energy transfer with said at least one photon reducing agent, wherein said at least one photon reducing agent is substantially impermeant to said membrane compartment, wherein said at least one photon reducing agent does not specifically bind to said membrane compartment, and wherein said at least one photon reducing agent is present in said aqueous solution at a concentration sufficient to reduce light emitted from said aqueous solution by at least 10% compared to the light emitted of said aqueous solution in the absence of said at least one photon reducing agent, c) detecting an optical signal from said at least one photon producing agent, d) comparing the optical signal from said at least one photon producing agent to a background or control optical signal from a control sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method of identifying a chemical with a toxicological activity, comprising:
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contacting a sample with a test chemical, wherein said sample comprises a membrane compartment in contact with a solid surface, and said sample comprises a target and at least one photon producing agent, contacting said sample with at least one photon reducing agent, wherein said at least one photon reducing agent is substantially impermeant to said membrane compartment, wherein said at least one photon reducing agent does not specifically bind to said membrane compartment, wherein said at least one photon reducing agent has an absorption spectrum that overlaps with the absorption, emission or excitation spectrum of said at least one photon producing agent, and wherein said at least one photon reducing agent is present in said sample at a concentration sufficient to reduce light emitted from said sample by at least 10% compared to the light emitted of said sample in the absence of said at least one photon reducing agent, and detecting an optical signal from said at least one photon producing agent, wherein said optical signal directly or indirectly monitors the toxicological activity of said test chemical.
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31. A method of identifying a chemical having a biological activity, comprising:
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a) contacting a sample with a test chemical, said sample comprising a target, b) contacting said sample with at least one photon reducing agent, wherein said sample comprises a membrane compartment, wherein said membrane compartment includes at least one photon producing agent that directly or indirectly monitors the activity of said target and said at least one photon reducing agent is in an aqueous solution that contacts the outer surface of said membrane compartment, and wherein said at least one photon reducing agent is substantially impermeant to said membrane compartment, wherein said at least one photon reducing agent does not specifically bind to said membrane compartment, wherein said at least one photon reducing agent has an absorption spectrum that overlaps with the absorption, emission or excitation spectrum of said at least one photon producing agent, and wherein at least one photon reducing agent is present in said aqueous solution at a concentration sufficient to reduce light emitted from said aqueous solution by at least 10% compared to the light emitted of said aqueous solution in the absence of said at least one photon reducing agent, c) detecting an optical signal from said at least one photon producing agent by fluorescence activated cell sorting (FACS), d) comparing the optical signal from said at least one photon producing agent to a background or control optical signal from a control sample.
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Specification