Skip directly to content

Add new comment

imammal's picture

Ubiquitination governs oscillation of cyclin-dependent kinase (CDK) activity through a periodic degradation of cyclins for orderly cell cycle progression; however, the mechanism that maintains the constant CDK protein levels throughout the cell cycle remains unclear. Here we show that CDK6 is modified by small ubiquitin-like modifier-1 (SUMO1) in glioblastoma, and that CDK6 SUMOylation stabilizes the protein and drives the cell cycle for the cancer development and progression. CDK6 is also a substrate of ubiquitin; however, CDK6 SUMOylation at Lys 216 blocks its ubiquitination at Lys 147 and inhibits the ubiquitin-mediated CDK6 degradation. Throughout the cell cycle, CDK1 phosphorylates the SUMO-specific enzyme, ubiquitin-conjugating enzyme9 (UBC9) that in turn mediates CDK6 SUMOylation during mitosis; CDK6 remains SUMOylated in G1 phase and drives the cell cycle through G1/S transition. Thus, SUMO1-CDK6 conjugation constitutes a mechanism of cell cycle control and inhibition of this SUMOylation pathway may provide a strategy for treatment of glioblastoma.

PMID:
24953629
PMCID:
PMC4090607
DOI:
10.1038/ncomms5234
[Indexed for MEDLINE] 

https://www.ncbi.nlm.nih.gov/pubmed/24953629