Array-based epitope-captured antibody display
First Claim
1. A method of analyzing the amino acid sequence of polypeptides by determining whether they share an epitope, the method comprising:
- (a) providing an array comprising a support and a population of replicable genetic package/antibody reagents immobilized to the support, each replicable genetic package/antibody reagent (package/antibody reagent) comprising (i) a replicable genetic package having a heterologous nucleic acid segment that encodes a first polypeptide displayed on the replicable genetic package and (ii) a captured antibody having a plurality of binding sites, each site having specific affinity for the first polypeptide, with at least one of the sites available for binding, the first polypeptide and the captured antibody complexed with it varying between at least some of the package/antibody reagents;
(b) contacting the population of package/antibody reagents with a sample containing a second polypeptide, whereby package/antibody reagents bearing captured antibodies having specific affinity for the second polypeptide bind to the second polypeptide;
(c) identifying at least one package/antibody reagent that binds to the second polypeptide; and
(d) determining the nucleotide sequence of the nucleic acid segment of the at least one package/antibody reagent, whereby the amino acid sequence corresponding to the nucleotide sequence can be deduced and is an indication of the amino acid sequence of an epitope shared by the first and second polypeptide.
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Accused Products
Abstract
Reagents and methods for detecting target proteins in a sample are provided. The reagents include a replicable genetic package, a protein displayed on an exterior surface of the package that is expressed from a heterologous nucleic acid borne by the package, and one or more antibodies complexed with the expressed protein and which have an open binding site for a target protein. Thus, a segment of the nucleic acid encodes for an epitope that is shared by the expressed polypeptide and the target protein. The reagents can be utilized individually or as part of a library or an array to bind target proteins within protein samples to form one or more complexes. By determining the sequence of the segment of the heterologous nucleic acid of a package within a complex, one can identify the target protein since the segment encodes for an epitope that is shared by the expressed and target proteins.
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Citations
20 Claims
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1. A method of analyzing the amino acid sequence of polypeptides by determining whether they share an epitope, the method comprising:
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(a) providing an array comprising a support and a population of replicable genetic package/antibody reagents immobilized to the support, each replicable genetic package/antibody reagent (package/antibody reagent) comprising (i) a replicable genetic package having a heterologous nucleic acid segment that encodes a first polypeptide displayed on the replicable genetic package and (ii) a captured antibody having a plurality of binding sites, each site having specific affinity for the first polypeptide, with at least one of the sites available for binding, the first polypeptide and the captured antibody complexed with it varying between at least some of the package/antibody reagents; (b) contacting the population of package/antibody reagents with a sample containing a second polypeptide, whereby package/antibody reagents bearing captured antibodies having specific affinity for the second polypeptide bind to the second polypeptide; (c) identifying at least one package/antibody reagent that binds to the second polypeptide; and (d) determining the nucleotide sequence of the nucleic acid segment of the at least one package/antibody reagent, whereby the amino acid sequence corresponding to the nucleotide sequence can be deduced and is an indication of the amino acid sequence of an epitope shared by the first and second polypeptide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of analyzing a sample containing a mixture of an polypeptides, the method comprising:
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(a) providing an array comprising a support and a plurality of replicable genetic package/antibody reagents immobilized to the support, wherein the package/antibody reagents each comprise a replicable genetic package that displays a polypeptide encoded by a segment of a nucleic acid of the package, the displayed polypeptide being complexed to a captured antibody having specific affinity for the displayed polypeptide, the displayed polypeptide and the captured antibody complexed to it varying between at least some of the package/antibody reagents; (b) contacting the array with the sample containing the mixture of polypeptides, whereby package/antibody reagents bearing captured antibodies having specific affinity for a target polypeptide in the mixture of polypeptides; (c) capturing the target polypeptide from the mixture by forming a complex between the captured antibody and the target polypeptide; and (d) detecting the complexes, the sequence of the segment of the nucleic acid of the package/antibody reagent within the complex and the corresponding amino acid sequence providing an indication of an amino acid sequence of an epitope on the captured target polypeptide. - View Dependent Claims (18, 19, 20)
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Specification