Neurospora expression system
First Claim
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1. A method of producing a mammalian peptide in a Neurospora fungus host, said method comprising:
- transforming by DNA uptake Neurospora spheroplasts with (1) a DNA construct comprising as operably linked components a constitutive promoter functional in said fungus host, a first DNA sequence encoding a mammalian peptide under the transcriptional regulation of said promoter and a transcriptional termination regulatory region functional in said host, and (2) a second DNA sequence comprising a marker gene which is expressed in said host;
selecting for transformed host cells comprising said construct by means of said marker gene;
identifying stably transformed host cells; and
growing said stably transformed host cells whereby said first DNA sequence is expressed, and said cells produce said mammalian peptide.
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Abstract
Neurospora crassa transformations are employed for production of heterologous proteins, where DNA constructs are prepared using a foreign gene under transcriptional and translational regulatory regions functional in Neurospora. A functional signal sequence is provided for secretion of the heterologous gene product. An auxotrophic Neurospora host is employed and transformed by the combination of the subject construct and a complementing gene. The resulting transformants provide for efficient secretion of the heterologous product.
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Citations
31 Claims
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1. A method of producing a mammalian peptide in a Neurospora fungus host, said method comprising:
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transforming by DNA uptake Neurospora spheroplasts with (1) a DNA construct comprising as operably linked components a constitutive promoter functional in said fungus host, a first DNA sequence encoding a mammalian peptide under the transcriptional regulation of said promoter and a transcriptional termination regulatory region functional in said host, and (2) a second DNA sequence comprising a marker gene which is expressed in said host; selecting for transformed host cells comprising said construct by means of said marker gene; identifying stably transformed host cells; and growing said stably transformed host cells whereby said first DNA sequence is expressed, and said cells produce said mammalian peptide.
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2. A method of producing a mammalian peptide in a Neurospora crassa host, said method comprising:
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transforming by DNA uptake N. crassa spheroplasts with (1) a DNA construct comprising as operably linked components a β
-tubulin promoter functional in said host, a first DNA sequence encoding a mammalian peptide under the transcriptional regulation of said β
-tubulin promoter and a transcriptional termination regulatory region functional in said host, and (2) a second DNA sequence comprising a marker gene which is expressed in said host;selecting for transformed host cells comprising said construct by means of said marker gene; identifying stably transformed host cells; and growing said stably transformed host cells whereby said first DNA sequence is expressed, and said cells produce said mammalian peptide.
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3. A DNA construct comprising a Neurospora β
- -tubulin promoter and a DNA sequence encoding a mammalian peptide under the transcriptional control of said promoter.
- View Dependent Claims (4)
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5. A stably transformed Neurospora cell containing a DNA construct comprising as operably linked components β
- -tubulin promoter functional in said cell, a first DNA sequence encoding a mammalian peptide under the transcriptional control of said β
-tubulin promoter and a transcriptional termination regulatory region functional in said cell; anda second DNA sequence comprising a marker gene expressed in said cell. - View Dependent Claims (6, 7, 8)
- -tubulin promoter functional in said cell, a first DNA sequence encoding a mammalian peptide under the transcriptional control of said β
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9. A method of producing and secreting in a Neurospora crassa host a mammalian peptide said method comprising:
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transforming by DNA uptake N. crassa spheroplasts with (1) a DNA construct comprising as operably linked components a β
-tubulin promoter, an open reading frame comprising a signal sequence for secretion joined to and in reading frame with a first DNA sequence encoding a mammalian peptide under the transcriptional regulation of said promoter and a transcriptional termination regulatory region functional in said host, and (2) a second DNA sequence comprising a marker gene which is expressed in said host;selecting for transformed host cells comprising said construct by means of said marker gene; identifying stably transformed host cells; and growing said stably transformed host cells whereby said first DNA sequence is expressed, and said cells produce and secrete said peptide.
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10. A stably transformed Neurospora cell containing a DNA construct comprising as operable components a Neurospora β
- -tubulin promoter and a first DNA sequence encoding a mammalian peptide under the transcriptional control of said promoter and a transcriptional termination regulatory region functional in said cell; and
a second DNA sequence comprising a marker gene which is expressed in said cell.
- -tubulin promoter and a first DNA sequence encoding a mammalian peptide under the transcriptional control of said promoter and a transcriptional termination regulatory region functional in said cell; and
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11. A stably transformed Neurospora crassa cell containing a DNA construct comprising as operable components a β
- -tubulin promoter and a first DNA sequence encoding a mammalian peptide under the transcriptional control of said promoter and a transcriptional termination regulatory region functional in said cell; and
a second DNA sequence comprising a marker gene which is expressed in said cell.
- -tubulin promoter and a first DNA sequence encoding a mammalian peptide under the transcriptional control of said promoter and a transcriptional termination regulatory region functional in said cell; and
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12. An isolated DNA construct comprising a Neurospora β
- -tubulin promoter and wherein said DNA construct is substantially free of a β
-tubulin open reading frame which expresses β
-tubulin.
- -tubulin promoter and wherein said DNA construct is substantially free of a β
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13. A method of obtaining a mammalian peptide, said method comprising:
isolating said mammalian peptide from a culture broth of stably transformed Neurospora fungus cells which produce said mammalian peptide, wherein said Neurospora fungus cells are derived from spheroplasts transformed by DNA uptake with a DNA construct comprising as operably linked components, a promoter functional in said Neurospora fungus cells, a first DNA sequence encoding a mammalian peptide under the transcriptional regulation of said promoter and a transcriptional termination regulatory region functional in said Neurospora fungus cells, a second DNA sequence comprising a marker gene which is expressed in said Neurospora fungus cells and a third DNA sequence encoding a secretion signal peptide joined to and in reading frame with said first DNA sequence. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26)
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14. A method of obtaining a mammalian peptide, said method comprising:
isolating said mammalian peptide from a culture broth of stably transformed Neurospora crassa cells which produce said mammalian peptide, wherein said Neurospora crassa cells are derived from spheroplasts transformed by DNA uptake with a DNA construct comprising as operably linked components, a promoter functional in said Neurospora crassa cells, a first DNA sequence encoding a mammalian peptide under the transcriptional regulation of said promoter and a transcriptional termination regulatory region functional in said Neurospora crassa cells, a second DNA sequence comprising a marker gene which is expressed in said Neurospora crassa cells and a third DNA sequence encoding a secretion signal peptide joined to and in reading frame with said first DNA sequence. - View Dependent Claims (23)
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27. A method of obtaining a mammalian peptide, said method comprising:
isolating said mammalian peptide from a culture broth of stably transformed Neurospora fungus cells which produce said mammalian peptide, wherein said Neurospora fungus cells are derived from spheroplasts transformed by DNA uptake with a DNA construct comprising as operably linked components, a Neurospora β
-tubulin promoter, a first DNA sequence encoding a mammalian peptide under the transcriptional regulation of said promoter and a transcriptional termination regulatory region functional in said Neurospora fungus cells, a second DNA sequence comprising a marker gene which is expressed in said Neurospora fungus cells and a third DNA sequence encoding a secretion signal peptide joined to and in reading frame with said first DNA sequence.- View Dependent Claims (28, 29)
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30. Stably transformed Neurospora fungus cells which produce a mammalian peptide.
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31. Stably transformed Neurospora fungus cells which secrete a mammalian peptide.
Specification