alexa Cyclin A is required at two points in the human cell cycle.
Oncology

Oncology

Journal of Cancer Science & Therapy

Author(s): Pagano M, Pepperkok R, Verde F, Ansorge W, Draetta G

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Abstract Cyclins play a fundamental role in regulating cell cycle events in all eukaryotic cells. The human cyclin A gene was identified as the site of integration of hepatitis B virus in a hepatocarcinoma cell line; in addition, cyclin A is associated with the E2F transcription factor in a complex which is dissociated by the E1A oncogene product. Such findings suggest that cyclin A is a target for oncogenic signals. We have now found that DNA synthesis and entry into mitosis are inhibited in human cells microinjected with anti-cyclin A antibodies at distinct times. Cyclin A binds both cdk2 and cdc2, giving two distinct cyclin A kinase activities, one appearing in S phase, the other in G2. These results suggest that cyclin A defines novel control points of the human cell cycle.
This article was published in EMBO J and referenced in Journal of Cancer Science & Therapy

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