Morphological mutants of filamentous fungi
First Claim
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1. A method for obtaining a mutant cell which produces a heterologous protein, comprising:
- (a) producing a first population of presumptive mutant cells from a Trichoderma parent cell;
(b) identifying from the first population a second population of presumptive mutant cells having a more restricted colonial phenotype or a more extensive hyphal branching than the parent cell; and
(c) identifying from the second population the mutant cell, comprising a nucleic acid sequence encoding a heterologous polypeptide, which has a radial extension rate which is at least 10% less than the parent cell, has a hyphal growth unit length that is at least 10% less than the parent cell, and has one or more improved properties selected from the group consisting of (i) produces at least about 10% more heterologous polypeptide than the parent cell, (ii) exhibits about 90% or less of the viscosity of the parent cell, and (iii) secretes more heterologous protein than the parent cell, when cultivated under the same conditions; and
(d) obtaining the mutant cell.
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Abstract
The present invention relates to methods of obtaining a mutant cell from a filamentous fungal parent cell, comprising: (a) obtaining mutant cells of the parent cell; (b) identifying the mutant cell which exhibits a more restricted colonial phenotype and/or a more extensive hyphal branching than the parent cell; and (c) identifying the mutant cell which has an improved property for production of a heterologous polypeptide than the parent cell, when the mutant and parent cells are cultured under the same conditions.
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Citations
20 Claims
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1. A method for obtaining a mutant cell which produces a heterologous protein, comprising:
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(a) producing a first population of presumptive mutant cells from a Trichoderma parent cell;
(b) identifying from the first population a second population of presumptive mutant cells having a more restricted colonial phenotype or a more extensive hyphal branching than the parent cell; and
(c) identifying from the second population the mutant cell, comprising a nucleic acid sequence encoding a heterologous polypeptide, which has a radial extension rate which is at least 10% less than the parent cell, has a hyphal growth unit length that is at least 10% less than the parent cell, and has one or more improved properties selected from the group consisting of (i) produces at least about 10% more heterologous polypeptide than the parent cell, (ii) exhibits about 90% or less of the viscosity of the parent cell, and (iii) secretes more heterologous protein than the parent cell, when cultivated under the same conditions; and
(d) obtaining the mutant cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 14)
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9. A method for producing a heterologous polypeptide, comprising:
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(a) cultivating a mutant cell of a Trichoderma parent cell under conditions suitable for production of the heterologous polypeptide, wherein the mutant cell comprises a nucleic acid sequence encoding the heterologous polypeptide, and wherein the mutant cell has a radial extension rate which is at least 10% less than the parent cell, has a hyphal growth unit length that is at least 10% less than the parent cell, and has one or more improved properties selected from the group consisting of (i) produces at least about 10% more heterologous polypeptide than the parent cell, (ii) exhibits about 90% or less of the viscosity of the parent cell, and (iii) secretes more heterologous protein than the parent cell, when cultivated under the same conditions; and
(b) recovering the heterologous polypeptide. - View Dependent Claims (10, 11, 12, 13)
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- 15. A mutant cell of a Trichoderma parent cell comprising a nucleic acid sequence encoding a heterologous polypeptide, wherein the mutant cell has a radial extension rate which is at least 10% less than the parent cell, has a hyphal growth unit length that is at least 10% less than the parent cell, and has one or more improved properties selected from the group consisting of (i) produces at least about 10% more heterologous polypeptide than the parent cell, (ii) exhibits about 90% or less of the viscosity of the parent cell, and (iii) secretes more heterologous protein than the parent cell, when cultivated under the same conditions.
Specification