The Saccharomyces diastaticus structural gene STA2, encoding an exracellular glucoamylase (1,4-alpha-D-glucan glycohydrolase, EC 3.2.1.3.), has been cloned by complementation of a stao strain. A genomic library was initially constructed from a STA2 yeast strain in the yeast Escherichia coli shuttle cosmid vector pYCl. The Sta+ complementing function was further delimited to an 8.3 kb BglII fragment whose restriction map was found to be similar to related genomic regions of STA1 and STA3. Fusions of several DNA fragments derived from the 8.3 kb BglII fragment with a truncated E. coli beta-galactosidase gene resulted in two overlapping fragments that could direct the production of large fusion proteins in E. coli. These fusion proteins were immunoprecipitable by anti-glucoamylase II antibodies, confirming that the Sta+ complementing fusion was due to the expression of a gene that coded for a yeast glucoamylase. Measurements of the STA1, STA2 and STA3 RNA transcripts by RNA-DNA hybridization using an internal fragment of the cloned STA2 gene as the probe indicated that a common transcript of 2.5 kb is produced by each of the STA genes. Integrative disruption of the STA2 gene through homologous recombination was achieved by transforming a STA2 yeast strain to Sta- using an in vitro constructed donor DNA fragment that has the URA3 gene inserted within the coding region of the cloned glucoamylase gene. This was confirmed by tetrad analysis of crosses between strains carrying a disrupted STA2 and a functional STA2. Southern blot analysis using BamHI digested genomic DNA from 15 tetrads demonstrated consistent co-segregation and Mendelian inheritance of the Sta- phenotype with STA2::URA3. These data further confirm that the cloned DNA that showed Sta+ complementing activity carries a functional STA2 gene that encodes the yeast extracellular glucoamylase II.
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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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