Methods for detecting allosteric modulators of protein
First Claim
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1. A method for identifying an agent B that binds to an allosteric site on a target protein, the method comprising:
- a. contacting the target protein with an agent A that binds to an active site of the target protein or wherein agent A is naturally bound to the active site of the target protein when isolated;
b. contacting the target protein with the agent B, wherein the target protein is labeled with a second harmonic-active moiety having a net orientation at an interface, wherein a detectable signal is generated by the second harmonic-active moiety using a surface selective technique, and wherein the detectable signal indicates a conformational change in the structure of the target protein produced when the agent B binds to an allosteric site on the target protein; and
c. measuring the presence or absence of the detectable signal after the target protein has been contacted with the agent B.
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Abstract
The present invention discloses, inter alia, methods for labeling a target protein with an SHG-active probe for detection by second harmonic or sum-frequency generation in order to identify agents which bind to an allosteric site on the target protein thereby altering its structural conformation.
15 Citations
44 Claims
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1. A method for identifying an agent B that binds to an allosteric site on a target protein, the method comprising:
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a. contacting the target protein with an agent A that binds to an active site of the target protein or wherein agent A is naturally bound to the active site of the target protein when isolated; b. contacting the target protein with the agent B, wherein the target protein is labeled with a second harmonic-active moiety having a net orientation at an interface, wherein a detectable signal is generated by the second harmonic-active moiety using a surface selective technique, and wherein the detectable signal indicates a conformational change in the structure of the target protein produced when the agent B binds to an allosteric site on the target protein; and c. measuring the presence or absence of the detectable signal after the target protein has been contacted with the agent B. - 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, 37, 38, 39, 40, 41, 42, 43, 44)
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28. A method for identifying a site-specific conformational change in the structure of a target protein upon binding of an agent to the protein, the method comprising:
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a. contacting the target protein with the agent in a first sample, wherein the target protein is labeled at a first amino acid residue with a second harmonic-active moiety having a net orientation at an interface, wherein a first detectable signal is generated by the second harmonic-active moiety using a surface selective technique, and wherein the first detectable signal indicates a conformational change in the structure of the target protein produced when the agent binds to a site on the target protein; b. contacting the target protein with the agent in a second sample, wherein the target protein is labeled at a second amino acid residue with a second harmonic-active moiety having a net orientation at an interface, wherein the second amino acid residue is located in a region of the target protein that differs from the location of the first amino acid residue, wherein a second detectable signal is generated by the second harmonic-active moiety using a surface selective technique, and wherein the second detectable signal indicates a conformational change in the structure of the target protein produced when the agent binds to a different site on the target protein; and c. comparing the first detectable signal with the second detectable signal, wherein a conformational change at the site of the first amino acid residue alone indicates that the agent induces a conformational change to the structure of the protein at the site of the first amino acid residue and wherein a conformational change at the site of the second amino acid residue alone indicates that the agent induces a conformational change to the structure of the protein at the site of the second amino acid residue. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
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Specification