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Progression of the mammalian cell cycle is regulated by phosphorylation of many key proteins. Several classes of cyclins (A-E) act as regulatory subunits for cyclin-dependent kinases (cdks). These cyclin-cdk holoenzymes are essential for proper control of cell cycle progression. They phosphorylate and regulate a variety of substrates whose activity is required for cell cycle transitions. The temporal expression of cyclins is tightly regulated throughout the cell cycle by synthesis and degradation. Such regulation plays a critical role in controlling the enzymatic activity of the cdks. Cyclin A, one of the mitotic cyclins, activates Cdk2 near the start of S phase and is necessary for the initiation of DNA replication. In mammalian somatic cells, Cyclin A is required during S phase and passage through G2. The D and E type cyclins regulate passage through G1, while Cyclin B is a critical regulator of mitosis. It has been shown in a number of species that mutation or disruption of normal Cyclin A expression causes cells to arrest at G2. Cyclin A binds both the cdc2 (Cdk1) and Cdk2 kinases and may also have a role in mitotic dependence on S phase completion.Host Species: MouseClone: 25Isotype: IgG1Species Reactivity: HumanImmunogen: Human Cyclin A aa. 26-144Formula Weight [Chemical]: 60kDaBioimaging, Immunofluorescence, Western Blotting
