14-3-3 proteins affect the cell surface expression of several unrelated cargo membrane proteins, e.g., MHC II invariant chain, the two-pore potassium channels KCNK3 and KCNK9, and a number of different reporter proteins exposing Arg-based endoplasmic reticulum localization signals in mammalian and yeast cells. These multimeric membrane proteins have a common feature in that they all expose coatomer protein complex I (COPI)- and 14-3-3-binding motifs. 14-3-3 binding depends on phosphorylation of the membrane protein in some and on multimerization of the membrane protein in other cases. Evidence from mutant proteins that are unable to interact with either COPI or 14-3-3 and from yeast cells with an altered 14-3-3 content suggests that 14-3-3 proteins affect forward transport in the secretory pathway. Mechanistically, this could be explained by clamping, masking, or scaffolding. In the clamping mechanism, 14-3-3 binding alters the conformation of the signal-exposing tail of the membrane protein, whereas masking or scaffolding would abolish or allow the interaction of the membrane protein with other proteins or complexes. Interaction partners identified as putative 14-3-3 binding partners in affinity purification approaches constitute a pool of candidate proteins for downstream effectors, such as coat components, coat recruitment GTPases, Rab GTPases, GTPase-activating proteins (GAPs), guanine-nucleotide exchange factors (GEFs) and motor 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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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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