We show that Mdv1 and Caf4, two components of the mitochondrial fission machinery in Saccharomyces cerevisiae, also function in peroxisome proliferation. Deletion of MDV1, CAF4 or both, however, had only a minor effect on peroxisome numbers at peroxisome-inducing growth conditions, most likely related to the fact that Vps1--and not Dnm1--is the key player in peroxisome fission in this organism. In contrast, in Hansenula polymorpha, which has only a Dnm1-dependent peroxisome fission machinery, deletion of MDV1 led to a drastic reduction of peroxisome numbers. This phenotype was accompanied by a strong defect in mitochondrial fission. The MDV1 paralog CAF4 is absent in H. polymorpha. In wild-type H. polymorpha, cells Dnm1-mCherry and green fluorescent protein (GFP)-Mdv1 colocalize in spots that associate with both peroxisomes and mitochondria. Furthermore, Fis1 is essential to recruit Mdv1 to the peroxisomal and mitochondrial membrane. However, formation of GFP-Mdv1 spots--and related to this normal organelle fission--is strictly dependent on the presence of Dnm1. In dnm1 cells, GFP-Mdv1 is dispersed over the surface of peroxisomes and mitochondria. Also, in H. polymorpha mdv1 or fis1 cells, the number of Dnm1-GFP spots is strongly reduced. These spots still associate to organelles but are functionally inactive.
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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 | 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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