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Science. 1992 Sep 18;257(5077):1689-94.

Formation and activation of a cyclin E-cdk2 complex during the G1 phase of the human cell cycle.

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  • 1Department of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA 98104.


Human cyclin E, originally identified on the basis of its ability to function as a G1 cyclin in budding yeast, associated with a cell cycle-regulated protein kinase in human cells. The cyclin E-associated kinase activity peaked during G1, before the appearance of cyclin A, and was diminished during exit from the cell cycle after differentiation or serum withdrawal. The major cyclin E-associated kinase in human cells was Cdk2 (cyclin-dependent kinase 2). The abundance of the cyclin E protein and the cyclin E-Cdk2 complex was maximal in G1 cells. These results provide further evidence that in all eukaryotes assembly of a cyclin-Cdk complex is an important step in the biochemical pathway that controls cell proliferation during G1.

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