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Intracellular localization of the cyclin-dependent kinase inhibitor p21CDKN1A-GFP fusion protein during cell cycle arrest
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Intracellular localization of the cyclin-dependent kinase inhibitor p21CDKN1A-GFP fusion protein during cell cycle arrest
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Journal Article
Intracellular localization of the cyclin-dependent kinase inhibitor p21CDKN1A-GFP fusion protein during cell cycle arrest
2004
Overview
The cyclin-dependent kinase (CDK) inhibitor p21CDKN1A is known to induce cell cycle arrest by inhibiting CDK activity and by interfering with DNA replication through binding to proliferating cell nuclear antigen. Although the molecular mechanisms have been elucidated, the temporal dynamics, as well as the intracellular sites of the activity of p21 bound to cyclin/CDK complexes during cell cycle arrest, have not been fully investigated. In this study we have induced the expression of p21CDKN1A fused to green fluorescent protein (GFP) in HeLa cells, in order to visualize the intracellular localization of the inhibitor during the cell cycle arrest. We show that p21-GFP is preferentially expressed in association with cyclin E in cells arrested in G1 phase, and with cyclin A more than with cyclin B1 in cells arrested in the G2/M compartment. In addition, we show for the first time that p21-GFP colocalizes with cyclin E in the nucleolus of HeLa cells during the G1 phase arrest.
Publisher
Springer Nature B.V
