A self-cloning module for gene knock-out and knock-in in industrial brewing yeast strain was constructed that contains copper resistance and gamma-glutamylcysteine synthetase gene cassette, flanked by alcohol dehydrogenase II gene (ADH2) of Saccharomyces cerevisiae. The module was used to obtain recombined strains RY1 and RY2 by targeting the ADH2 locus of host Y1. RY1 and RY2 were genetically stable. PCR and enzyme activity analysis of RY1 and RY2 cells showed that one copy of ADH2 was deleted by GSH1+CUP1 insertion, and an additional copy of wild type was still present. The fermentation ability of the recombinants was not changed after genetic modification, and a high level of glutathione (GSH) was secreted, resulting from GSH1 overexpression, which codes for gamma-glutamylcysteine synthetase. A pilot-scale brewing test for RY1 and RY2 indicated that acetaldehyde content in fermenting liquor decreased by 21-22%, GSH content increased by 20-22% compared with the host, the antioxidizability of the recombinants was improved, and the sensorial evaluation was also better than that of the host. No heterologous DNA was harbored in the recombinants; therefore, they could be applied in the beer industry in terms of their biosafety.
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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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