CDK4 (cyclin-dependent kinase 4) is a 34kD member of the CMGC Ser/Thr protein kinase family of enzymes. Within the cell, pRb/retinoblastoma protein is normally unphosphorylated and suppresses cell growth at the G1 stage of the cell cycle. When mitosis is required, CDK4 is phosphorylated, forms a complex with cyclin D1, 2 or 3, and phosphorylates pRb/retinoblastoma protein. This inactivates pRb and cells initiate DNA synthesis. Human CDK4 is 303aa in length. It contains one protein kinase domain (aa6-295) and an activating phosphorylation site at Thr172. There are three potential variants; one that shows an alternate start site at Met75, a second that shows a twoaa substitution for aa89-211, and a third that shows a 23aa substitution for aa89-303. Full-length human and mouse CDK4 are 95% aa identical.
Applications:
Suitable for use in Western Blot. Other applications not tested.
Recommended Dilution:
Western Blot: 1ug/ml
Optimal dilutions to be determined by the researcher.
Storage and Stability:
Lyophilized powder may be stored at -20 degrees C. Stable for 12 months at -20 degrees C. Reconstitute with PBS. Aliquot to avoid repeated freezing and thawing. Store at -20 degrees C. Reconstituted product is stable for 12 months at -20 degrees C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.
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