The mitochondrial division machinery consists of the large dynamin-related protein Dnm1p (Drp1/Dlp1 in humans), and Fis1p, Mdv1p and Caf4p. Proper assembly of Dnm1p complexes on the mitochondrial surface is crucial for balanced fission and fusion events. Using quantitative confocal microscopy, we show that Caf4p is important for the recruitment of Dnm1p to the mitochondria. The mitochondrial Dnm1p assemblies can be divided into at least two morphologically distinguishable fractions. A small subset of these assemblies appear to be present as Dnm1p-spirals (or rings) that encircle tubule constrictions, with seldom more than seven turns. A larger fraction of the Dnm1p assemblies is primarily present at one side of the mitochondrial tubules. We show that a majority of these mitochondria-associated Dnm1p clusters point towards the cell cortex. This polarized orientation is abolished in fis1Delta and caf4Delta yeast cells, but is maintained in mdv1Delta cells and after disruption of the actin cytoskeleton. This study suggests that Caf4p plays a key role in determining the polarized localization of those Dnm1p clusters that are not immediately involved in the mitochondrial fission process.
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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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