Src homology 3 (SH3) domains are small non-catalytic protein modules capable of mediating protein-protein interactions by binding to proline-X-X-proline (P-X-X-P) motifs. Here we demonstrate that the SH3 domain of the integral peroxisomal membrane protein Pex13p is able to bind two proteins, one of which, Pex5p, represents a novel non-P-X-X-P ligand. Using alanine scanning, two-hybrid and in vitro interaction analysis, we show that an alpha-helical element in Pex5p is necessary and sufficient for SH3 interaction. Sup pressor analysis using Pex5p mutants located in this alpha-helical element allowed the identification of a unique site of interaction for Pex5p on the Pex13p-SH3 domain that is distinct from the classical P-X-X-P binding pocket. On the basis of a structural model of the Pex13p-SH3 domain we show that this interaction probably takes place between the RT- and distal loops. Thus, the Pex13p-SH3-Pex5p interaction establishes a novel mode of SH3 interaction.
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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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Evidence ID | Analyze ID | File | Description |
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