Function:Essential for the control of the cell cycle at the late G1 and early S phase. ,induction:Activated by papilloma viral oncoproteins E6 and E7 which bind to and inactivate p53 and Rb , respectively. ,PTM:Phosphorylation by CDK2 triggers its release from CDK2 and degradation via the ubiquitin proteasome pathway. ,similarity:Belongs to the cyclin family. ,similarity:Belongs to the cyclin family. Cyclin E subfamily. ,subunit:Interacts with the CDK2 (in vivo) and CDK3 (in vitro) protein kinases to form a serine/threonine kinase holoenzyme complex. The cyclin subunit imparts substrate specificity to the complex. ,tissue specificity:According to PubMed:9858585: highest levels in adult testis , thymus and brain. Lower levels in placenta , spleen and colon. Consistently elevated levels in tumor-derived cells compared to non-transformed proliferating cells. According to PubMed:9840927: low levels in thymus , prostate , brain , skeletal muscle , and kidney. Elevated levels in lung. According to PubMed:9840943: highly expressed in testis , placenta , thymus and brain. In a lesser extent in small intestine and colon. ,
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