Compositions for isolating a cDNA encoding a membrane-bound protein
First Claim
1. A cDNA library comprising a mixture of vectors, each of which comprises (a) a DNA encoding a secretable protein that binds to an antigen and (b) a cDNA ligated at the 3′
- end of the DNA encoding the secretable protein, wherein the secretable protein is invariable for all of the vectors in the library and is selected from the group consisting of an antibody, a fragment thereof, and a single-chain antibody, and wherein the cDNA in at least one of the vectors encodes a membrane-bound protein.
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Abstract
A method, vector, 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, vector, and kit disclosed herein are particularly useful for identifying genes for membrane-bound proteins represented in cDNA libraries.
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Citations
20 Claims
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1. A cDNA library comprising a mixture of vectors, each of which comprises (a) a DNA encoding a secretable protein that binds to an antigen and (b) a cDNA ligated at the 3′
- end of the DNA encoding the secretable protein, wherein the secretable protein is invariable for all of the vectors in the library and is selected from the group consisting of an antibody, a fragment thereof, and a single-chain antibody, and wherein the cDNA in at least one of the vectors encodes a membrane-bound protein.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
Specification