Yeast cells engineered to produce pheromone system protein surrogates, and uses therefor
First Claim
1. A yeast cell having a pheromone system, which cell comprises(a) a first heterologous gene encoding a heterologous surrogate of a yeast pheromone system protein, said surrogate being a kinase and performing in the pheromone system of the yeast cell a function naturally performed by the corresponding yeast pheromone system protein, and(b) a second heterologous gene encoding a heterologous peptide, wherein said heterologous peptide modulates the interaction of said surrogate with said pheromone system in the yeast cell, and said modulation is a selectable or screenable event.
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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.
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Citations
48 Claims
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1. A yeast cell having a pheromone system, which cell comprises
(a) a first heterologous gene encoding a heterologous surrogate of a yeast pheromone system protein, said surrogate being a kinase and performing in the pheromone system of the yeast cell a function naturally performed by the corresponding yeast pheromone system protein, and (b) a second heterologous gene encoding a heterologous peptide, wherein said heterologous peptide modulates the interaction of said surrogate with said pheromone system in the yeast cell, and said modulation is a selectable or screenable event.
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21. A mixture of recombinant yeast cells, each cell of which comprises;
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(i) a pheromone system generating a detectable signal; (ii) an expressible gene construct encoding a heterologous surrogate of a yeast pheromone system protein, said surrogate being a kinase and performing in the pheromone system; and (iii) an expressible gene construct encoding a heterologous peptide, wherein collectively the mixture of cells express a library of said heterologous peptides, and modulation of the pheromone system by the heterologous peptide provides the detectable signal. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. A mixture of recombinant yeast cells, each cell of which comprises:
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(i) a pheromone system generating a detectable signal; (ii) an expressible gene construct encoding a heterologous surrogate of a yeast pheromone system protein, said surrogate being a kinase and performing in the pheromone system; and (iii) an expressible gene construct encoding a heterologous peptide, said heterologous peptide including a signal sequence for secretion into the periplasmic space, wherein collectively the mixture of cells express a library of said heterologous peptides, and modulation of the pheromone system by the heterologous peptide provides the detectable signal. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36)
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37. A method for identifying potential effectors of a yeast pheromone surrogate, comprising:
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(i) providing a mixture of recombinant yeast cells, each cell of which comprises (a) a pheromone system generating a detectable signal; (b) an expressible gene construct encoding a heterologous surrogate of a yeast protein of the pheromone system, said surrogate being a kinase and performing in the pheromone system; and (c) an expressible gene construct encoding a heterologous peptide, wherein collectively the mixture of cells express a library of said heterologous peptides, and modulation of the pheromone system by the heterologous peptide provides the detectable signal; and (ii) isolating cells from the mixture which exhibit the detection signal. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45)
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Specification