Many hormones, growth factors, and cytokines regulate proliferation of their target cells. Perhaps the most universal signaling cascades required for proliferative responses are those initiated by transient rises in intracellular calcium (Ca(2+)). The major intracellular receptor for Ca(2+) is calmodulin (CaM). CaM is a small protein that contains four EF-hand Ca(2+) binding sites and is highly conserved among eukaryotes. In all organisms in which the CaM gene has been deleted, it is essential. Although Ca(2+)/CaM is required for proliferation in both unicellular and multicellular eukaryotes, the essential targets of Ca(2+)/CaM-dependent pathways required for cell proliferation remain elusive. Potential Ca(2+)/CaM-dependent targets include the serine/threonine phosphatase calcineurin and the family of multifunctional Ca(2+)/CaM-dependent protein kinases. Whereas these enzymes are essential in Aspergillus nidulans, they are not required under normal growth conditions in yeast. However, in mammalian cells, studies demonstrate that both types of enzymes contribute to the regulation of cell cycle progression. Unfortunately, the mechanism by which Ca(2+)/CaM and its downstream targets, particularly calcineurin and the Ca(2+)/CaM-dependent protein kinases, regulate key cell cycle-regulatory proteins, remains enigmatic. By understanding how Ca(2+)/CaM regulates cell cycle progression in normal mammalian cells, we may gain insight into how hormones control cell division and how cancer cells subvert the need for Ca(2+) and its downstream targets to proliferate.
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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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