Endocytosis of plasma membrane proteins is mediated by their interaction with adaptor proteins. Conversely, emerging evidence suggests that adaptor protein recruitment to the plasma membrane may depend on binding to endocytic cargo. To test this idea, we analyzed the yeast adaptor protein Sla1, which binds membrane proteins harboring the endocytic signal NPFxD via the Sla1 SHD1 domain. Consistently, SHD1 domain point mutations that disrupted NPFxD binding caused a proportional reduction in Sla1-GFP recruitment to endocytic sites. Furthermore, simultaneous SHD1 domain point mutation and deletion of the C-terminal LxxQxTG repeat (SR) region linking Sla1 to coat proteins Pan1 and End3 resulted in total loss of Sla1-GFP recruitment to the plasma membrane. These data suggest that multiple interactions are needed for recruitment of Sla1 to the membrane. Interestingly, a Sla1 fragment containing just the third SH3 domain, which binds ubiquitin, and the SHD1 domain displayed broad surface localization, suggesting plasma membrane recruitment is mediated by interaction with both NPFxD-containing and ubiquitylated plasma membrane proteins. Our results also imply that a Sla1 NPF motif adjacent to the SR region might regulate the Sla1-cargo interaction, mechanistically linking Sla1 cargo binding to endocytic site recruitment.
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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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