Unlabelled: Ovalbumin (OVA) is an important egg white protein that is widely used in food applications owing to its functional properties. Although precision fermentation offers a sustainable alternative for OVA production, limited extracellular secretion remains a significant challenge. To address this gap, this study aimed to develop a growth-coupled screening strategy for identifying a novel gene that enhances OVA secretion in Saccharomyces cerevisiae. To achieve this, an OVA-β-glucosidase (GH1) fusion protein was used to link secretion efficiency to cellobiose-dependent growth. A genome-wide CRISPR interference (CRISPRi) library was introduced into an OVA-GH1-expressing strain and screened under isolated conditions. Repression of YBR013C, a gene of unknown function, consistently resulted in superior growth. Reintroduction of the YBR013C-targeting CRISPRi plasmid reproduced this phenotype and increased extracellular OVA-GH1 levels. This study identifies YBR013C as a novel factor associated with protein secretion and presents a generalizable screening platform for improving protein secretion in yeast.
Supplementary information: The online version contains supplementary material available at 10.1007/s10068-026-02231-8.
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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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