Cyclin E1 functions as a regulator of the cell cycle, promoting the G1 to S phase transition by binding to and activating the cyclin dependent kinase CDK2. The abundance of cyclin E1 fluctuates during a normal cell cycle and is controlled at the level of gene transcription and by ubiquitin dependent proteolysis. Non-complexed cyclin E1 is degraded by the Cul3 pathway, however when cyclin E1 is bound to CDK2 its ubiqutination is dependent on a positive phosphorylation status, which enables its recognition by SCF^Fbw7. The impact of cyclin E1 quantities on cell cycle regulation is reflected in the elevated levels expressed by many types of human tumours.

Flocked swab:
Spray-on Nylon is the secret to flocked swab technology. The short, perpendicular fiber strands produced by the spray on method, creates an absorbent, thin-layer open structure that enhances both sample collection and release through the natural capillary movement of liquid along the fibers. Elution of the liquid and solid specimen sample is rapid and automatic because they are maintained close to the surface of the swab between the nylon strands, spontaneously draining when placed in liquid or onto solid media. Swab shafts are scored at a specific break-point for easy transfer of the tip into transportation media.

For Specific Activity data, refer to the Certificate of Analysis for individual lots of this enzyme.

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