Menkes disease is a fatal neurodegenerative disorder of childhood caused by the absence or dysfunction of a putative P-type ATPase encoded on the X chromosome. To elucidate the function of the Menkes disease protein, a plasmid containing the open reading frame of the human Menkes disease gene was constructed and used to transform a strain of Saccharomyces cerevisiae deficient in CCC2, the yeast Menkes/Wilson disease gene homologue. ccc2Delta yeast are deficient in copper transport into the secretory pathway, and expression of a wild type human Menkes cDNA complemented this defect, as evidenced by the restoration of copper incorporation into the multicopper oxidase Fet3p. Site-directed mutagenesis demonstrated the essential role of four specific amino acids in this process, including a conserved histidine, which is the site of the most common disease mutation in the homologous Wilson disease protein. The expression of Menkes cDNAs with successive mutations of the conserved cysteine residues in the six amino-terminal MXCXXC metal binding domains confirmed the essential role of these cysteine residues in copper transport but revealed that each of these domains is not functionally equivalent. These data demonstrate that the Menkes disease protein functions to deliver copper into the secretory pathway of the cell and that this process involves biochemical mechanisms common to previously characterized members of this P-type ATPase family.
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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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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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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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