The BUB/MAD signaling pathway monitors attachment of chromosomes to spindle poles in mitotic cells. Mutations of the human BUB1 locus were identified in cancer cells exhibiting an unstable chromosomal complement. We report that the human BUB3 gene maps to a site on chromosome 10 subject to frequent modification in cancers. Thus, defects in BUB/MAD signaling may contribute to genetic instability and to cancer progression. In vitro, BUB1 and BUB3 proteins form a complex of monomers of each protein. These proteins interact with the human MAD1 gene product, a target of the HTLV-1 tax oncogene. This multiprotein complex exhibits a kinase activity with a requirement for lysine 821 in the BUB1 kinase motif, resulting in BUB1 autophosphorylation and phosphorylation of associated MAD1.
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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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