Mnt1p is an alpha 1.2-mannosyltransferase which resides in an early compartment of the Saccharomyces cerevisiae Golgi apparatus. We have shown that the signal-anchor region is sufficient, and the transmembrane domain necessary, for its normal Golgi localization. This is similar to the transmembrane domain-mediated retention of mammalian glycosyltransferases, and distinct from the tail-mediated recycling retention of certain mammalian and yeast trans-Golgi proteins. To examine the mechanism involved in transmembrane domain-mediated retention, we have isolated six classes of mutants which fail to retain Mnt1p-reporter fusions in the early Golgi. These mutants all show additional phenotypes which are consistent with alterations in Golgi function. We have called the mutant classes 'gem', for Golgi enzyme maintenance. GEM3 is identical to the previously cloned gene ANP1, and homologous to VAN1 and MNN9. Together, these define a new class of proteins involved in the organization and functioning of the secretory pathway. Interestingly, Anp1p is localized to the endoplasmic reticulum (ER), implying that some function of the ER is required to maintain a functional Golgi apparatus.
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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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