Yeast cells engineered to produce pheromone system protein surrogates and uses therefor
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 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 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 receptor by a heterologous polypeptide within the library provides a detectable signal.
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Abstract
Yeast cells are engineered to express both a surrogate of a pheromone system protein (e.g., enzymes involved in maturation of α-factor, transporters of a-factor, pheromone receptors, etc.) and a potential peptide modulator of the surrogate, in such a manner that the inhibition or activation of the surrogate affects a screenable or selectable trait of the yeast cells. Various additional features improve the signal-to-noise ratio of the screening/selection system.
32 Citations
21 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 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 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 receptor by a heterologous polypeptide within the library provides a detectable signal. - View Dependent Claims (2, 3, 4, 5)
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6. A method for identifying a modulator of a heterologous receptor protein expressed by a yeast cell, comprising:
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(i) providing a mixture of recombinant yeast cells, each cell of which has a cell membrane and comprises (a) a heterologous 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; and
(b) a heterologous test polypeptide, wherein the heterologous test polypeptide is transported to a location allowing interaction with the extracellular region of the receptor expressed in the cell membrane;
wherein collectively the mixture of cells expresses a library of said heterologous test polypeptides, said library being expressible at a sufficient level such that modulation of the signal transduction activity of the receptor by a heterologous test polypeptide within the library provides a detectable signal;
(ii) allowing cells within the mixture to generate a detectable signal; and
(iii) identifying the heterologous test polypeptide as a modulator of the heterologous receptor protein expressed by the yeast cell. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A recombinant yeast cell which has a cell membrane and which comprises:
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(a) a heterologous 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; and
(b) a heterologous polypeptide, wherein the heterologous polypeptide is transported to a location allowing interaction with the extracellular region of the receptor expressed in the cell membrane;
wherein modulation of the signal transduction activity of the receptor by the heterologous polypeptide provides a detectable signal. - View Dependent Claims (19, 20, 21)
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Specification