It has been known that enzyme activity associated with the yeast LEU1 and LEU2 gene product (beta-isopropylmalate dehydrogenase) drops sharply when yeast is grown in the presence of leucine. RNA blot hybridizations with LEU2-specific probes establish that this is accompanied by a 5-fold repression in LEU2 mRNA levels. A similar repression was noted recently for LEU1 mRNA levels (Hsu, Y.-P., and Schimmel, P. (1984) J. Biol. Chem. 259, 3714-3719). Nuclease mapping of the 5'-end of the LEU2 mRNA shows a major start at approximately 16 nucleotides upstream of the AUG initiation codon. This initiation site in the gene is retained in an extensive LEU2 5'-noncoding region deletion which still expresses the LEU2 gene product (Erhart, E., and Hollenberg, C. P. (1983) J. Bacteriol. 156, 625-635). The primary structure of the LEU2 gene product was established from the nucleotide sequence of the gene-coding region and from fitting amino acid sequences of scattered internal peptides to the nucleotide sequence. The 364-amino acid protein has a 13-amino acid stretch which is highly homologous to the partially sequenced yeast LEU1 gene product (isopropylmalate isomerase). The homology occurs about 290 amino acids from the respective NH2 termini of the two proteins. The homology may represent residues which interact with beta-isopropylmalate, a common ligand for the enzymes.
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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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