Rat, human, and chicken liver and yeast fatty acid synthetase complexes were dissociated into half-molecular weight nonidentical subunits of molecular weight 225,000-250,000 under the same conditions as used previously for the pigeon liver fatty acid synthetase complex [Lornitzo, F. A., Qureshi, A. A., and Porter, J. W. (1975) J. Biol. Chem. 250, 4520-45291. The separation of the half-molecular weight nonidentical subunits I and II of each fatty acid synthetase was then achieved by affinity chromatography on Sepharose epsilon-aminocaproyl pantetheine. The separations required, as with the pigeon liver fatty acid synthetase, a careful control of temperature, ionic strength, pH, and column flow rate for success, along with the freezing of the enzyme at -20C prior to the dissociation of the complex and the loading of the subunits onto the column. The separated subunit I (reductase) from each fatty acid synthetase contained beta-ketoacyl and crotonyl thioester reductases. Subunit II (transacylase) contained acetyl- and malonyl-coenzyme A: pantetheine transacylases. Each subunit of each complex also contained activities for the partial reactions, P-hydroxyacyl thioester dehydrase (crotonase), and palmitoyl-CoA deacylase. The specific activities of a given partial reaction did not vary in most cases more than twofold from one fatty acid synthetase species to another. The rat and human liver fatty acid synthetases required a much higher ionic strength for stability of their complexes and for the reconstitution of their overall synthetase activity from subunits I and II than did the pigeon liver enzyme. On reconstitution by dialysis in high ionic strength potassium phosphate buffer of subunits I and II of each complex, 65-85% of the control fatty acid synthetase activity was recovered. The rat and human liver fatty acid synthetases cross-reacted on immunoprecipitation with antisera. Similarly, chicken and pigeon liver fatty acid synthetases cross-reacted with their antisera. There was, however, no cross-reaction between the mammalian and avian liver fatty acid synthetases and the yeast fatty acid synthetase did not cross-react with any of the liver fatty acid synthetase antisera.
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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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