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Introduction The c-Jun coactivator, Jun activation-domain binding protein 1 (Jab1) also known as the fifth component of the COP9 signalosome complex (CSN5), is a novel candidate oncogene whose aberrant expression contributes to the progression of breast carcinoma and other human cancers. The mechanism of Jab1 gene expression and its deregulation in cancer cells remains to be identified. We therefore...
The cyclin-dependent kinase (CDK) inhibitor p27 Kip1 (p27) is an important regulator of cell cycle progression controlling the transition from G to S-phase. Low p27 levels or accelerated p27 degradation correlate with excessive cell proliferation and poor prognosis in several forms of cancer. Phosphorylation of p27 at Thr187 by cyclin E–CDK2 is required to initiate the ubiquitination-proteasomal...
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