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Science. 1992 Feb 28;255(5048):1144-7.

Association of cdk2 kinase with the transcription factor E2F during S phase.

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  • 1European Molecular Biology Laboratory, Heidelberg, Germany.


The transcription factor E2F controls the expression of several proliferation-related genes and is a target of the adenovirus E1A oncogene. In human cells, both cyclin A and the cdk2 protein kinase were found in complexes with E2F. Although the total amounts of cdk2 were constant in the cell cycle, binding to E2F was detected only when cells entered S phase, a time when the cdk2 kinase is activated. These data suggest that the interaction between cdk2 and E2F requires an active kinase that has cyclin A as a targeting component.

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