Methods and compositions for identifying receptor effectors
First Claim
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1. A mixture of recombinant yeast cells, each cell of which has a cell membrane and each cell of which comprises:
- (a) a heterologous receptor selected from the group consisting of;
an FPRL-1 receptor, a C5a receptor and a thrombin receptor, which receptor is expressed in the cell membrane of said cell such that signal transduction activity via said receptor is modulated by interaction of an extracellular region of the receptor with an extracellular signal; and
(b) a heterologous polypeptide, wherein the heterologous polypeptide is transported to a location allowing interaction with the extracellular region of the heterologous receptor expressed in the cell membrane;
wherein collectively the mixture of cells expresses a library of said heterologous polypeptides, said library being expressible at a sufficient level such that modulation of the signal transduction activity of the heterologous receptor by a heterologous polypeptide within the library provides a detectable signal.
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Abstract
The present invention makes available a rapid, effective assay for screening and identifying pharmaceutically effective compounds that specifically interact with and modulate the activity of a cellular receptor or ion channel. The subject assay enables rapid screening of large numbers of polypeptides in a library to identifying those polypeptides which induce or antagonize receptor bioactivity. The subject assay is particularly amenable for identifying surrogate ligands for orphan receptors.
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Citations
25 Claims
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1. A mixture of recombinant yeast cells, each cell of which has a cell membrane and each cell of which comprises:
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(a) a heterologous receptor selected from the group consisting of;
an FPRL-1 receptor, a C5a receptor and a thrombin receptor, which receptor is expressed in the cell membrane of said cell such that signal transduction activity via said receptor is modulated by interaction of an extracellular region of the receptor with an extracellular signal; and(b) a heterologous polypeptide, wherein the heterologous polypeptide is transported to a location allowing interaction with the extracellular region of the heterologous receptor expressed in the cell membrane; wherein collectively the mixture of cells expresses a library of said heterologous polypeptides, said library being expressible at a sufficient level such that modulation of the signal transduction activity of the heterologous receptor by a heterologous polypeptide within the library provides a detectable signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A mixture of recombinant yeast cells, each cell of which has a cell membrane and each cell of which comprises:
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(a) a heterologous receptor selected from the group consisting of an FPRL-1 receptor, a C5a receptor, and a thrombin receptor expressed in the cell membrane of said cell such that signal transduction activity via said receptor is modulated by interaction of an extracellular region of the receptor with an extracellular signal, said heterologous receptor acting as a surrogate for an endogenous yeast pheromone receptor in a pheromone system pathway of the yeast cell; (b) a heterologous polypeptide, wherein the heterologous polypeptide is transported to a location allowing interaction with the extracellular region of the heterologous receptor expressed in the cell membrane; and (c) a selectable marker that is activated by the pheromone system pathway; wherein collectively the mixture of cells expresses a library of said heterologous polypeptides, said library being expressible at a sufficient level such that modulation of the signal transduction activity of the heterologous receptor by a heterologous polypeptide within the library provides a detectable signal mediated by the selectable marker; and wherein said yeast cells have a mutation in at least one gene selected from the group consisting of FAR1, SST2, BAR1, SVG1, STE2, STE3, MFa1, MFa2, MFα
1 and MFα
2.- View Dependent Claims (24, 25)
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Specification