Cornichon proteins are structurally related transmembrane proteins that have been studied in and Drosophila and yeast. In Drosophila, Cornichon (Cni) is involved in embryo polarization by the TGFalpha-related Gurken. In yeast, the Cni-related Erv14 is required for axial budding. A cargo receptor function has been proposed for Erv14 and Cni. Four mammalian Cni-like sequences have been identified. We carried out parallel functional analyses of the human Cni ortholog CNIH and Drosophila Cni in the processing and presentation of TGFalpha family proteins. Human CNIH complements the loss of Erv14 in yeast. Human CNIH and Drosophila Cni are primarily localized in the endoplasmic reticulum and associate with immature TGFalpha family proteins. Alterations of cornichon expression result in changes in transport, processing and secretion of TGFalpha proteins. In particular, increased cornichon expression retains TGFalpha proteins in the endoplasmic reticulum, whereas cornichon is required for their transport and secretion. Thus, cornichon proteins represent a functionally conserved protein family that acts in the selective transport and maturation of TGFalpha family proteins.
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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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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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