A yeast (Saccharomyces cerevisiae) secretory expression vector containing PRO3 gene was constructed (pCBy310). beta HCG(Human choriogonadotropin beta subunit)-cDNA was inserted into pCBy310 to form a recombinant plasmid pCBy314. Since yeast proline auxotroph will not survive in rich medium (YPD), YPD could be used as a selection pressure, and pCBy314 could be maintained mitotically stable in transformants of yeast Pro3- auxotroph (MB299-7A) in rich medium. At an improved, yet not optimized cultural condition, the expression of beta HCG in culture medium was 650 micrograms/L. Our results showed not only that YPD could be used as a selection medium, but also that yeast grew better in YPD so as to increase the gene expression product, and that the component of YPD was simple and cheap. Our data suggested that PRO genes might be used widely in constructing vectors to clone and express foreign genes in yeast so that rich medium can be used as a selection pressure for direct selection.
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| Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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| Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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| Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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| Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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| Site | Modification | Modifier | Source | Reference |
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| Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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| Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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| Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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| Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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