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Cyclin D1 elicits transcriptional effects through inactivation of the retinoblastoma protein and direct association with transcriptional regulators. The current work reveals a molecular relationship between cyclin D1/CDK4 kinase and protein arginine methyltransferase 5 (PRMT5), an enzyme associated with histone methylation and transcriptional repression. Primary tumors of a mouse lymphoma model exhibit...
SCFFbx4 was recently identified as the E3 ligase for cyclin D1. We now describe cell-cycle-dependent phosphorylation and dimerization of Fbx4 that is regulated by GSK3β and is defective in human cancer. We present data demonstrating that a pathway involving Ras-Akt-GSK3β controls the temporal phosphorylation and dimerization of the SCFFbx4 E3 ligase. Inhibition of Fbx4 activity results in accumulation...
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