Biosensor for small molecule analytes
First Claim
1. A composition for detecting the presence of an analyte in a sample comprising (i) a purified protein that specifically binds the analyte (ii) a purified nucleic acid containing a specific binding sequence which is bound specifically by the protein;
- and (iii) a detection system that indicates a change in binding of the protein to the nucleic acid in the presence of the analyte, which detection system is selected from the group consisting of a surface plasmon resonance system, electrochemical transducer, optical transducer, colorimetric-based system, fluorescent-based system, sandwich assay and electrochemical system.
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Abstract
A biosensor device for detecting small molecules analytes is provided. The device employs a first class of molecules, e.g., protein that binds to both the analyte and a second class of molecules, e.g., nucleic acid. The binding of the protein to the analyte and nucleic acid can be mutually exclusive, and the presence of analyte in a sample results in a detectable displacement of protein from nucleic acid. Alternatively, binding of the protein to the nucleic acid can depend on the presence of analyte in the sample. In a specific embodiment, either the protein or nucleic acid is immobilized on a solid phase support. An arsenic detection system is exemplified. An ArsR binding sequence from the E. coli ars operon is immobilized on a gold-plated surface. ArsR protein binds to the DNA in the absence of arsenic, and is released in the presence of sodium arsenate or phenylarsine oxide. Protein release results in a change in surface plasmon resonance, and the magnitude or kinetics of the change indicate the concentration of arsenic.
34 Citations
37 Claims
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1. A composition for detecting the presence of an analyte in a sample comprising (i) a purified protein that specifically binds the analyte (ii) a purified nucleic acid containing a specific binding sequence which is bound specifically by the protein;
- and (iii) a detection system that indicates a change in binding of the protein to the nucleic acid in the presence of the analyte, which detection system is selected from the group consisting of a surface plasmon resonance system, electrochemical transducer, optical transducer, colorimetric-based system, fluorescent-based system, sandwich assay and electrochemical system.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A biosensor device for detecting the presence of an analyte in a sample comprising (i) a protein that specifically binds the analyte;
- (ii) a purified nucleic acid containing a specific binding sequence which is bound specifically by the protein; and
(iii) a detection system that indicates a change in binding of the protein to the nucleic acid in the presence of the analyte, which detection system is selected from the group consisting of a surface plasmon resonance system, electrochemical transducer, optical transducer, colorimetric-based system, fluorescent-based system, sandwich assay and electrochemical system;
wherein either the protein or the nucleic acid is bound to a solid phase support. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
- (ii) a purified nucleic acid containing a specific binding sequence which is bound specifically by the protein; and
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22. A method of detecting the presence of an analyte in a sample, which method comprises:
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a. contacting the sample with a protein that specifically binds the analyte, which protein is bound to a purified nucleic acid containing a specific binding sequence for the protein, wherein binding of the protein to the analyte is mutually exclusive of binding to the nucleic acid; and
b. detecting release of the protein from the nucleic acid by use of a detection system selected from the group consisting of a surface plasmon resonance system, electrochemical transducer, optical transducer, colorimetric-based system, fluorescent-based system, sandwich assay and electrochemical system. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. (canceled)
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33. (canceled)
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34. (canceled)
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35. (canceled)
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36. (canceled)
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37. (canceled)
Specification