Activation-state-specific phosphoprotein immunodetection
First Claim
1. A method for producing antibody that specifically binds to one of the two isoforms of a reversibly phosphorylated protein and does not bind to the other isoform of said protein nor to proteins other than said protein, said method comprising the steps of:
- a) providing a peptide consisting essentially of a reversible phosphorylation site of said protein, a phosphorylatable amino acid in said reversible phosphorylation site being in the phosphorylation state of one of the two isoforms of said protein, said phosphorylation state having been achieved chemically and not enzymatically;
b) raising antibodies against said peptide;
c) isolating a population of antibodies reactive with said peptide;
d) screening said population for antibodies not reactive with said peptide wherein said peptide is in the phosphorylation state of the other isoform of said protein, said phosphorylation state having been achieved chemically and not enzymatically;
e) collecting antibodies identified in screening step (d); and
f) testing antibodies collected in step (e) to verify that the antibodies specifically bind said protein and not proteins other than said protein.
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Reexamination
Accused Products
Abstract
Activation-state-specific and protein-specific antiphosphoprotein antibodies and methods for their production are disclosed. Also disclosed are methods for evaluating the prognosis and therapeutic outcome for patients using the antiphosphoprotein antibodies and methods for characterizing the activation state of a reversibly phosphorylated protein, kits including the antibodies for use in characterizing the activation state of a protein, and methods for evaluating the agonist or antagonist activity of pharmaceutically useful compounds towards the conversion of a specific protein from its inactive to its active state.
97 Citations
22 Claims
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1. A method for producing antibody that specifically binds to one of the two isoforms of a reversibly phosphorylated protein and does not bind to the other isoform of said protein nor to proteins other than said protein, said method comprising the steps of:
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a) providing a peptide consisting essentially of a reversible phosphorylation site of said protein, a phosphorylatable amino acid in said reversible phosphorylation site being in the phosphorylation state of one of the two isoforms of said protein, said phosphorylation state having been achieved chemically and not enzymatically; b) raising antibodies against said peptide; c) isolating a population of antibodies reactive with said peptide; d) screening said population for antibodies not reactive with said peptide wherein said peptide is in the phosphorylation state of the other isoform of said protein, said phosphorylation state having been achieved chemically and not enzymatically; e) collecting antibodies identified in screening step (d); and f) testing antibodies collected in step (e) to verify that the antibodies specifically bind said protein and not proteins other than said protein. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. Antibody that specifically binds to a reversible tyrosine phosphorylation site of a reversibly phosphorylated protein in its phosphorylated isoform and does not bind to the non-phosphorylated isoform of said protein, nor to proteins other than said protein.
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15. Antibody that specifically binds to a reversible tyrosine phosphorylation site of a reversibly phosphorylated protein in its non-phosphorylated isoform and does not bind to the phosphorylated isoform of said protein, nor to proteins other than said protein.
- 16. Antibody that specifically binds to a reversible phosphorylation site of the c-erbB-2 receptor in its active form and does not bind to the inactive form of said c-erbB-2 receptor, nor to proteins other than said c-erbB-2 receptor.
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18. A kit for use in identifying the activation state of a reversibly phosphorylated protein in a sample by determining whether said protein is in its active or inactive isoform, said kit comprising
components required for extraction of said sample; - and
components necessary for use in a binding assay, said binding assay components comprising antibody that specifically binds to a reversible phosphorylation site of the active isoform of said protein and does not bind to the inactive isoform of said protein nor to proteins other than said protein. - View Dependent Claims (20, 21, 22)
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19. A kit for use in identifying the activation state of a reversibly phosphorylated protein in a sample by determining whether said protein is in its active or inactive isoform, said kit comprising
components required for extraction of said sample; - and
components necessary for use in a binding assay, said binding assay components comprising antibody that specifically binds to a reversible phosphorylation site of the inactive isoform of said protein and does not bind to the active isoform of said protein nor to proteins other than said protein.
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Specification