Tethered receptor-ligand reagent and assay
First Claim
1. :
- A reagent for measuring one or more test factors, said reagent comprising;
a ligand receptor protein, and a reagent ligand that can bind to a ligand binding site on said protein;
said protein and said reagent ligand being tightly coupled together by a tether that is chemically distinct from the protein and the reagent ligand;
wherein the test factors alter the ability of the reagent ligand to bind to the ligand binding site on said protein;
and wherein the binding or non binding of the reagent ligand to the ligand binding site on said protein creates a detectable signal.
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Abstract
A tethered reagent and assay is disclosed consisting of protein receptors tethered to ligands. The protein receptors can be antibodies, enzymes, hormone receptors, integral membrane proteins, and other proteins. Ligands can be antigens, enzymatic inhibitors, hormone agonists, drugs, and other protein binding ligands. The protein receptors and ligands will each be labeled with moieties capable of detecting changes in the average distance between the protein receptors and the ligand, using detection methods in which there is a sharp fall-off in signal as a function of distance. As a result, a change in the average distance between the two label moieties, such as that caused by protein-ligand binding and dissociation, produces a change in a detectable signal produced by the reagent. Tethering means may consist of flexible polymers, typically composed of a material that is chemically distinct from either the receptor or the ligand, so that the receptors and ligands may freely associate and dissociate via their specific binding sites, but not totally diffuse away from each other. When bound to solid phase surfaces, such reagents are particularly well suited for proteomic microarrays and flow cells. Such reagents may have utility for immunoassays, enzyme assays, ligand binding assays, sepsis assays, drug screening assays, and drug ADMET assays.
30 Citations
20 Claims
-
1. :
- A reagent for measuring one or more test factors, said reagent comprising;
a ligand receptor protein, and a reagent ligand that can bind to a ligand binding site on said protein;
said protein and said reagent ligand being tightly coupled together by a tether that is chemically distinct from the protein and the reagent ligand;
wherein the test factors alter the ability of the reagent ligand to bind to the ligand binding site on said protein;
and wherein the binding or non binding of the reagent ligand to the ligand binding site on said protein creates a detectable signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- A reagent for measuring one or more test factors, said reagent comprising;
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10. :
- A device for measuring one or more test factors,
said device containing a surface with one or more reagents tightly bound to said surface;
said reagent or reagents comprising;
a ligand receptor protein, and a reagent ligand that can bind to a ligand binding site on said protein;
said protein and said reagent ligand being tightly coupled together by a tether that is chemically distinct from the protein and the reagent ligand;
wherein the test factors alter the ability of the reagent ligand to bind to the ligand binding site on said protein;
and wherein the binding or non binding of the reagent ligand to the ligand binding site on said protein alters the resonance transfer of photons between a first moiety associated with the protein, and a second moiety associated with the reagent ligand, producing a detectable signal;
- View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
- A device for measuring one or more test factors,
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18. :
- A method of analyzing test factors, comprising;
applying said factors to a flow cell containing one or more reagents, said reagents comprising;
a ligand receptor protein, and a reagent ligand that can bind to a ligand binding site on said protein;
said protein and said reagent ligand being tightly coupled together by a tether that is chemically distinct from the protein and the reagent ligand;
wherein the ability of the test factors to cause changes in the detectable signal emitted by the reagents is observed. - View Dependent Claims (19, 20)
- A method of analyzing test factors, comprising;
Specification