Anti-CDC25B Antibody Picoband® Fluoro488 Conjugated

Central to the onset of mitosis in all eukaryotic cells is the CDC2 protein kinase, the activity of which is negatively regulated by phosphorylation and positively activated by dephosphorylation. The latter function is carried out by a specific phosphatase, CDC25. At least 3 human CDC25 genes code for the A, B, and C forms of CDC25. CDC25B is mapped to 20p13. P38 kinase has a critical role in the initiation of a G2 delay after ultraviolet radiation. Inhibition of p38 blocks the rapid initiation of this checkpoint in both human and murine cells after ultraviolet radiation. In vitro, p38 binds and phosphorylates CDC25B at serines 309 and 361, and CDC25C at serine-216; phosphorylation of these residues is required for binding to 14-3-3 proteins. In vivo, inhibition of p38 prevents both phosphorylation of CDC25B at serine-309 and 14-3-3 binding after ultraviolet radiation, and mutation of this site is sufficient to inhibit the checkpoint initiation. Regulation of CDC25B phosphorylation by p38 is a critical event for initiating the G2/M checkpoint after ultraviolet radiation.

C-C chemokine receptor type 1; C-C CKR-1; CC-CKR-1; CCR-1; CCR1; Macrophage inflammatory protein 1-alpha receptor; MIP-1alpha-R; RANTES-R; CD191; Ccr1; Cmkbr1

Receptor for a C-C type chemokine. Binds to MIP-1-alpha, RANTES, and less efficiently, to MIP-1-beta or MCP-1 and subsequently transduces a signal by increasing the intracellular calcium ions level. Responsible for affecting stem cell proliferation.

1. Bulavin, D. V., Higashimoto, Y., Popoff, I. J., Gaarde, W. A., Basrur, V., Potapova, O., Appella, E., Fornace, A. J., Jr.Initiation of a G2/M checkpoint after ultraviolet radiation requires p38 kinase.Nature 411: 102-107, 2001. 2. Lane, S. A., Baker, E., Sutherland, G. R., Tonks, I., Hayward, N., Ellem, K.The human cell cycle gene CDC25B is located at 20p13.Genomics 15: 693-694, 1993.