The localization of proteins to the Golgi complex is a dynamic process requiring sorting signals in the cytosolic domains of resident Golgi proteins and retrograde vesicular trafficking. Disruptions in these signals or in the retrograde pathways often lead to mislocalization of Golgi proteins to the vacuole in budding yeast. The extent of vacuolar mislocalization can be quantified through colocalization of GFP-tagged Golgi proteins with fluorescent dyes that mark either the vacuole limiting membrane or the vacuole lumen. Manders' colocalization coefficient (MCC) is a useful tool for quantifying the degree of colocalization. However, the dilution of fluorescence signal intensity that occurs when GFP-tagged Golgi proteins mislocalize to the much larger vacuole is problematic for thresholding the images prior to calculating the MCC. In this chapter, we describe the use of Multi-Otsu thresholding in ImageJ to quantify the degree of GFP-tagged protein mislocalization to the vacuole. Furthermore, these methods can be applied to other colocalization events within the cell.
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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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