Yeast phosphofructokinase is an octamer composed of two different kinds of subunit. The genes coding for these subunits have been isolated by means of functional complementation in a pfk1 pfk2 double mutant. As a source of DNA the genomic library of Nasmyth and Tatchell (1980) constructed in the yeast multicopy vector YEp13 was used. Plasmids containing the information of one or the other gene were identified by back-transformation into pfk single mutants (pfk1 PFK2, PFK1 pfk2). Restriction maps of the respective insertions are provided. The genomic organization was confirmed by Southern analysis. Northern analysis showed hybridization to mRNAs of about 3.6 kb for both genes, corresponding to the molecular weight of the protein subunits. Transformation with one of the plasmids did not lead to an increase in phosphofructokinase activity. Subcloning of both genes in one multicopy vector (YEp13) and reintroduction into the yeast cell resulted in a 3.5-fold higher specific activity compared to the wild type. Overproduction of the protein subunits in this transformant was confirmed by SDS-polyacrylamide electrophoresis of crude extracts stained with Coomassie-blue. This was not accompanied by an increased ethanol production. The sequences encoding the two subunits were shown to share homology.
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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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