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Product Includes Quantity (with Count) Solution Color
Phospho-Rb (Ser807/811) Antibody 9308 30 µl
Kinase Buffer (10X) 9802 15 ml
ATP (10 mM) 9804 1 ml

Product Description

The kit provides a means of performing kinase activity assays with recombinant human CDK2/CycA kinase. It includes active CDK2/CycA kinase (supplied as a GST fusion protein), a biotinylated peptide substrate and a phospho-serine/threonine antibody for detection of the phosphorylated form of the substrate peptide.


Molecular Formula:

Peptide substrate, Biotin-Rb (Ser807/811): GSK-CDK2: 60kDa, GST-CycA: 75 kDa.


Peptide Core Sequence:

IS*PLKS*P


Cyclins and cyclin-dependent kinases (CDK) are key regulators in mammalian cell cycle. Regulation of these complexes occurs through cyclin production and its destruction, relocation, inhibitory/activating phoshorylation, relocation and modification by other proteins. Each cyclin associates with one or two CDKs and most CDKs associate with one or two cyclins (1-3). CDK1 forms a complex with cyclin A/B and regulates phosphorylation of cytoskeleton proteins involved in mitosis. CDK2 and CDK3 form complexes with cyclin E, which regulate the G1-S phase transition while the CDK2/CycA complex regulates S phase progression (4,5). CDK4/CycD and CDK6/CycD are activated by mitogenic signaling during early G1 and progressively accumulate as cells transition through this phase of the cell cycle. CDK5 is activated in postmitotic neurons and regulates neuron migration during brain development (6). CDK7/CycH is believed to form a link between transcription and cell cycle. CDK8/CycC and CDK9/CycT are involved in transcription (1,2). The kinase activity of CDKs is tightly regulated by phosphorylation and protein-protein interactions. Activation of CDKs requires binding to a specific cyclin and phosphorylation of a conserved threonine residue in a region called the T loop. Examining the phosphorylation of peptides by CDK/cyclin complexes suggests that both CDKs and cyclins play a role in recognizing substrates. A consensus sequence, (S/T)PX(R/K), is identified in the peptides that are phosphorylated by CDK/cyclins.


1.  Schang, L.M. (2002) J. Antimicrob. Chemother. 50, 779-792.

2.  Chow, J.P. et al. (2003) J. Biol. Chem. 278, 40815-40828.

3.  Hofmann, F. and Livingston, D.M. (1996) Genes Dev. 10, 851-861.

4.  Golsteyn, R.M. (2005) Cancer Lett. 217, 129-138.

5.  Murray, A.W. (2004) Cell 116, 221-234.

6.  Xie, Y. and Tsai, L.H. (2004) Cell Cycle 3, 108-110.

7.  Holmes, J.K. and Solomon, M.J. (1996) J Biol Chem 271, 25240-6.


Entrez-Gene Id 1017 , 8900
Swiss-Prot Acc. P24941 , P78396

Data Sheets & Documentation


For Research Use Only. Not For Use In Diagnostic Procedures.
Cell Signaling Technology® is a trademark of Cell Signaling Technology, Inc.
DELFIA® is a registered trademark of PerkinElmer, Inc.