The transition from metaphase to anaphase and exit from mitosis involve the degradation of active cyclin B-CDC2 complexes by ubiquitin-mediated proteolysis. The anaphase-promoting complex (APC) catalyzes the formation of cyclin B-ubiquitin conjugates, thereby targeting cyclin B for degradation. The APC is composed of eight proteins, including four members of a family characterized by multiple tetratricopeptide repeats (TPR). We mapped two overlapping expressed sequence tag clones within a genomic contig on human chromosome 5, band q31. A search revealed high homology to Saccharomyces cerevisiae CDC23, a TPR protein component of the APC. We have isolated the human CDC23 cDNA containing the full-length predicted open reading frame. The approximately 3.3-kb message is ubiquitously expressed and encodes a protein with 591 amino acids (MW = 68,293 Da) and 9 TPR units. The protein has 30% identity and 51% similarity to the S. cerevisiae protein. The human CDC23 gene contains 16 exons and spans approximately 31 kb. CDC23 maps within the smallest commonly deleted segment in myeloid leukemias characterized by a deletion of 5q; however, we detected no mutations of CDC23 in leukemia cells with loss of 5q. Thus, CDC23 is unlikely to be involved in the pathogenesis of myeloid leukemias characterized by abnormalities of chromosome 5.
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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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