Macroautophagy is essential to cell survival during starvation and proceeds by the growth of a double-membraned phagophore, which engulfs cytosol and other substrates. The synthesis and recognition of the lipid phosphatidylinositol 3-phosphate, PI(3)P, is essential for autophagy. The key autophagic PI(3)P sensors, which are conserved from yeast to humans, belong to the PROPPIN family. Here we report the crystal structure of the yeast PROPPIN Hsv2. The structure consists of a seven-bladed β-propeller and, unexpectedly, contains two pseudo-equivalent PI(3)P binding sites on blades 5 and 6. These two sites both contribute to membrane binding in vitro and are collectively required for full autophagic function in yeast. These sites function in concert with membrane binding by a hydrophobic loop in blade 6, explaining the specificity of the PROPPINs for membrane-bound PI(3)P. These observations thus provide a structural and mechanistic framework for one of the conserved central molecular recognition events in autophagy.
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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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Evidence ID | Analyze ID | File | Description |
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