A cyclin A-protein kinase complex possesses sequence-specific DNA binding activity: p33cdk2 is a component of the E2F-cyclin A complex

Cell. 1992 Jan 10;68(1):167-76. doi: 10.1016/0092-8674(92)90215-x.


The E2F transcription factor has been found in association with the cyclin A protein, and this complex accumulates during the S phase of the cell cycle, suggesting that E2F may play a role in cell cycle control. In independent studies, cyclin A has been shown to be associated with two other proteins, the Rb-related p107 protein and the cdc2-related p33 cdk2 protein kinase. Through an analysis of the E2F-cyclin A complex, we now find that both the p107 protein and the cdc2-related p33cdk2 kinase are components of the previously described complex. Moreover, the complex possesses H1 kinase activity. These results thus define a cyclin A-cdk2 kinase complex that possesses sequence-specific DNA binding activity. This suggests that the cdk2 kinase may phosphorylate other DNA-bound substrates, and that one role of the E2F factor may be to localize this protein kinase to the DNA.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • 3T3 Cells
  • Animals
  • Blotting, Western
  • CDC2-CDC28 Kinases*
  • Carrier Proteins*
  • Cell Cycle
  • Cell Cycle Proteins*
  • Cell Line
  • Cyclin-Dependent Kinase 2
  • Cyclin-Dependent Kinases*
  • Cyclins / isolation & purification
  • Cyclins / metabolism*
  • DNA-Binding Proteins / isolation & purification
  • DNA-Binding Proteins / metabolism*
  • E2F Transcription Factors
  • Humans
  • L Cells
  • Macromolecular Substances
  • Mice
  • Models, Structural
  • Protamine Kinase / metabolism
  • Protein Kinases / isolation & purification
  • Protein Kinases / metabolism*
  • Protein-Serine-Threonine Kinases*
  • Retinoblastoma-Binding Protein 1
  • S Phase
  • Transcription Factor DP1
  • Transcription Factors / isolation & purification
  • Transcription Factors / metabolism*


  • Arid4a protein, mouse
  • Carrier Proteins
  • Cell Cycle Proteins
  • Cyclins
  • DNA-Binding Proteins
  • E2F Transcription Factors
  • Macromolecular Substances
  • Retinoblastoma-Binding Protein 1
  • Transcription Factor DP1
  • Transcription Factors
  • Protein Kinases
  • Protamine Kinase
  • Protein-Serine-Threonine Kinases
  • CDC2-CDC28 Kinases
  • CDK2 protein, human
  • Cdk2 protein, mouse
  • Cyclin-Dependent Kinase 2
  • Cyclin-Dependent Kinases