The eukaryotic initiation factor 2B (eIF2B) serves an essential recycling function in protein synthesis. As the guanine nucleotide exchange factor for eIF2, it recycles eIF2 from a GDP to a GTP bound form that is competent for translation initiation. Stress-dependent controls target this eIF2B-recycling step allowing a reprogramming of the global gene expression profile. In addition, a human disease, leukoencephalopathy with vanishing white matter (VWM), is caused by mutations in the eIF2B subunit genes. Recently, we have found that the eIF2B guanine nucleotide exchange factor resides in a specific cytoplasmic focus in the yeast, Saccharmoyces cerevisiae. eIF2B is a resident feature of this focus, whereas eIF2 shuttles to and fro. Moreover, the in vivo rate of eIF2 shuttling correlates with changes in guanine nucleotide exchange activity implicating this large cytoplasmic focus as a site of guanine nucleotide exchange. In this perspective, we discuss these findings in the wider context of the assortment of guanine nucleotide exchange factors.
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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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