During peroxisomal matrix protein import, the peroxisomal targeting signal receptors recognize cargo in the cytosol and interact with docking and translocation subcomplexes on the peroxisomal membrane. Using immunoprecipitations of multiple protein components, we show that in Pichia pastoris the docking subcomplex consists of the unique peroxins Pex13p, Pex14p and Pex17p, whereas the putative translocation subcomplex has all three RING-finger peroxins, Pex2p, Pex10p and Pex12p, as unique constituents. We identify Pex3p as a shared component of both subcomplexes. In pex3delta cells, the unique constituents of the docking subcomplex interact as they do in wild-type cells, but the assembly of the translocation subcomplex is impaired and its components are present at reduced levels. Furthermore, several interactions detected in wild-type cells between translocation and docking subcomplex components are undetectable in pex3delta cells. Contrary to previous reports, pex3delta cells have peroxisome remnants that pellet during high-speed centrifugation, associate with membranes on floatation gradients and can be visualized by deconvolution microscopy using antibodies to several peroxins which were not available earlier. We discuss roles for Pex3p in the assembly of specific peroxisomal membrane protein subcomplexes whose formation is necessary for matrix protein import.
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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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