Methods for isolating a cDNA encoding a membrane-bound protein
First Claim
1. A method for isolating or identifying a gene encoding a membrane-bound protein, the method comprising the steps of(i) introducing into cells a vector comprising a sequence comprising (a) a DNA encoding a secretable protein and (b) a cDNA ligated downstream of the secretable protein-encoding DNA, wherein the secretable protein can bind to an antigen and is selected from the group consisting of an antibody, a fragment of an antibody, and a single-chain antibody;
- (ii) expressing in the cells a fusion protein encoded by the sequence comprising (a) and (b);
(iii) contacting the cells of (ii) with the antigen;
(iv) selecting a cell that binds to the antigen; and
(v) isolating or identifying the cDNA comprised in the vector that was introduced into the selected cell.
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Abstract
A method and kit are provided for selectively isolating genes encoding membrane-bound proteins by fusing proteins to a secretable protein having a binding affinity to an antigen (e.g., an antibody), expressing these fusions in host cells, and selectively isolating individual host cells by their ability to bind the antigen via the fusion protein. Host cells expressing fusion proteins that do not contain a membrane binding domain will be relatively unable to bind the antigen, since the fusion proteins in those cells are secreted and unattached to their host cells. The method and kit disclosed herein are particularly useful for identifying genes for membrane-bound proteins represented in cDNA libraries.
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13 Claims
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1. A method for isolating or identifying a gene encoding a membrane-bound protein, the method comprising the steps of
(i) introducing into cells a vector comprising a sequence comprising (a) a DNA encoding a secretable protein and (b) a cDNA ligated downstream of the secretable protein-encoding DNA, wherein the secretable protein can bind to an antigen and is selected from the group consisting of an antibody, a fragment of an antibody, and a single-chain antibody; -
(ii) expressing in the cells a fusion protein encoded by the sequence comprising (a) and (b);
(iii) contacting the cells of (ii) with the antigen;
(iv) selecting a cell that binds to the antigen; and
(v) isolating or identifying the cDNA comprised in the vector that was introduced into the selected cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification