A diploid yeast strain displaying both α-amylase and glucoamylase was developed for repeated fermentation from raw starch. First, the construct of α-amylase was optimized for cell surface display, as there have been no reports of α-amylase-displaying yeast. The modified yeast displaying both glucoamylase and α-amylase produced 46.5 g/l of ethanol from 200 g/l of raw corn starch after 120 h of fermentation, and this was 1.5-fold higher when compared to native α-amylase-displaying yeast. Using the glucoamylase and modified α-amylase co-displaying diploid strain, we repeated fermentation from 100g/l of raw starch for 23 cycles without the loss of α-amylase or glucoamylase activity. The average ethanol productivity and yield during repeated fermentation were 1.61 g/l/h and 76.6% of the theoretical yield, respectively. This novel yeast may be useful for reducing the cost of bio-ethanol production and may be suitable for industrial-scale bio-ethanol production.
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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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