The products of the Saccharomyces cerevisiae CIN1, CIN2 and CIN4 genes participate in a nonessential pathway required for normal microtubule function. In this article, we demonstrate that the product of PAC2 also functions in this pathway. PAC2 deletion mutants displayed phenotypes and genetic interactions similar to those caused by cin1 delta, cin2 delta and cin4 delta. These include cold-sensitive microtubule structures and sensitivity to the microtubule depolymerizing agent benomyl. Involvement in a common functional pathway is indicated by the observation that all double mutant recombinations are viable and no more affected than any single mutant. In addition, extra copies of CIN1 were found to suppress the benomyl sensitivity of pac2 delta, cin2 delta and cin4 delta, but not that caused by other mutations that affect microtubule function. Cin1p and Pac2p were found to be related in sequence to mammalian proteins that aid in the folding of beta-tubulin into an assembly-competent state. Alleles of CIN1 were identified that could suppress the benomyl sensitivity of cin4-4 in a highly specific fashion. Our findings suggest that the guanine nucleotide-binding Cin4p interacts with Cin1p and regulates its tubulin folding activity.
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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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