In mammals, L-lysine is first catabolized to alpha-aminoadipate semialdehyde by the bifunctional enzyme alpha-aminoadipate semialdehyde synthase (AASS), followed by a conversion to alpha-aminoadipate by alpha-aminoadipate semialdehyde dehydrogenase. In Saccharomyces cerevisiae, which synthesize rather than degrade lysine, the latter activity requires two distinct genes. LYS2 encodes the alpha-aminoadipate reductase activity, while LYS5 encodes a phosphopantetheinyl transferase activity that is required to activate Lys2p. We have identified a full-length human cDNA homologous to the yeast LYS5 gene. The cDNA contains an open-reading frame of 930 bp predicted to encode 309 amino acids, and the human protein is 26% identical and 44% similar to its yeast counterpart. In Northern blot analysis the cDNA hybridizes to a single transcript of approximately 3 kb in all tissues except testis, where there is an additional transcript of 1.5 kb. Expression is highest in brain followed by heart and skeletal muscle, and to a lesser extent in liver. We further identified three human genomic BAC clones containing the human gene. Fluorescence in situ hybridization (FISH) analysis using the BAC clones mapped the gene to chromosome 11q22 while alignment of the cDNA and genomic sequences allowed partial identification of the intron-exon boundaries. Finally, using one-step homologous recombination in S. cerevisiae we generated a lys5 knockout strain. Complementation studies in the yeast knockout demonstrate that the human homolog encodes alpha-aminoadipate dehydrogenase phosphopantetheinyl transferase activity. We hypothesize that defects in this gene may result in pipecolic acidemia.
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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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