Methods for generating phosphorylation site-specific immunological reagents
First Claim
1. A method for isolating polyclonal antibodies which bind specifically to a phosphorylated polypeptide which is phosphorylated at a particular amino acid, comprising:
- a) providing a synthetic polypeptide comprising a mimetic of the particular amino acid which is phosphorylated, the synthetic polypeptide being formulated in a physiologically acceptable carrier;
b) immunizing an animal with the synthetic polypeptide of step a);
c) collecting and preparing serum or ascitic fluid from the immunized animal of step b);
d) screening for the presence of antibodies specific for the phosphorylated polypeptide; and
e) when necessary, further enriching for antibodies specific for the phosphorylated polypeptide through conventional methods.
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Abstract
The present invention provides methods for generating phosphorylation site-specific immunological reagents. More specifically, a phosphopeptide mimetic is incorporated into a polypeptide in place of a phosphorylated amino acid. The polypeptide is used as antigen by standard methods to generate either monoclonal or polyclonal antibodies which cross-react with the naturally phosphorylated polypeptide. The phosphopeptide mimetic preferably contains a non-hydrolyzable linkage from the appropriate carbon atom of the amino acid residue to a phosphate group. A preferred linkage is a CF2 group. Such a linkage is used to generate the phosphoserine mimetic F2Pab, which is incorporated into a polypeptide sequence derived from p53 to produce antibodies which recognize a specific phosphorylation state of p53. A CF2 group linkage is also used to produce the phosphothreonine mimetic F2Pmb, and to produce the phosphotyrosine mimetic, F2Pmp.
19 Citations
32 Claims
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1. A method for isolating polyclonal antibodies which bind specifically to a phosphorylated polypeptide which is phosphorylated at a particular amino acid, comprising:
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a) providing a synthetic polypeptide comprising a mimetic of the particular amino acid which is phosphorylated, the synthetic polypeptide being formulated in a physiologically acceptable carrier;
b) immunizing an animal with the synthetic polypeptide of step a);
c) collecting and preparing serum or ascitic fluid from the immunized animal of step b);
d) screening for the presence of antibodies specific for the phosphorylated polypeptide; and
e) when necessary, further enriching for antibodies specific for the phosphorylated polypeptide through conventional methods. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for isolating monoclonal antibodies which bind specifically to a phosphorylated polypeptide which is phosphorylated at a particular amino acid, comprising:
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a) providing a synthetic polypeptide comprising a mimetic of the particular amino acid which is phosphorylated, the synthetic polypeptide being formulated in a physiologically acceptable carrier;
b) immunizing an animal with the synthetic polypeptide of step a);
c) collecting B-cells from the animal of step b) d) generating hybridomas by fusing the B-cells of step c) with myeloma cells;
e) screening the hybridomas of step d) for antibodies which bind specifically to the phosphorylated polypeptide;
f) isolating and propagating hybridomas identified in step e); and
g) isolating monoclonal antibodies from the isolated and propagated hybridomas of step f). - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification