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Updated: May 25, 2026

Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
Published on: May 3, 2018
Cyclin D1 is a NF-κB corepressor.
María F Rubio1, Pablo N Larrosa Fernandez, Cecilia V Alvarado
1Laboratorio de Biología Molecular y Apoptosis, Instituto de Investigaciones Médicas Alfredo Lanari (IDIM-CONICET), Universidad de Buenos Aires, Combatientes de Malvinas 3150, C1427ARO Buenos Aires, Argentina.
Cyclin D1 (CD1) inhibits NF-κB activity, but RAC3 can reverse this effect. The balance of CD1 and RAC3 expression influences tumor cell proliferation, impacting cancer progression.
Area of Science:
- Molecular Biology
- Cell Biology
- Oncology
Background:
- Nuclear factor-kappa B (NF-κB) is a key regulator of gene expression.
- Cyclin D1 (CD1) and RAC3 are proteins involved in cell cycle regulation and transcriptional activity.
Purpose of the Study:
- To investigate the regulatory role of Cyclin D1 (CD1) on NF-κB transcriptional activity.
- To understand how RAC3 influences the interaction between CD1 and NF-κB.
Main Methods:
- Investigated the effect of CD1 on NF-κB activity in tumoral and non-tumoral cells.
- Utilized transfection to over-express CD1 and RAC3 individually and simultaneously.
- Analyzed protein expression patterns in relation to the cell cycle.
Main Results:
- CD1 was found to inhibit NF-κB transcriptional activity via a corepressor function.
- Over-expression of RAC3 reverted the inhibitory effect of CD1 on NF-κB.
- Individual over-expression of CD1 or RAC3 enhanced cell proliferation, while simultaneous over-expression inhibited it.
- RAC3 and CD1 expression patterns are cell-cycle regulated with distinct peaks.
Conclusions:
- The relative amounts and expression timing of CD1 and RAC3 are critical in modulating tumor cell proliferation.
- These oncogenes can influence the balance of tumor growth in response to external signals.
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