Function:Essential for the control of the cell cycle at the G1/S (start) transition. ,PTM:Phosphorylation of Thr-395 by GSK3 and of Ser-399 by CDK2 accelerates degradation via the ubiquitin proteasome pathway. Phosphorylated upon DNA damage , probably by ATM or ATR. ,similarity:Belongs to the cyclin family. Cyclin E subfamily. ,subunit:Interacts with a member of the CDK2/CDK protein kinases to form a serine/threonine kinase holoenzyme complex. The cyclin subunit imparts substrate specificity to the complex. Interacts with retinoblastoma binding protein 3 and retinoblastoma-like protein 1. Found in a complex with CDK2 , CABLES1 and CCNA1 (By similarity) . Part of a complex consisting of UHRF2 , CDK2 and CCNE1. ,tissue specificity:Highly expressed in testis and placenta. Low levels in bronchial epithelial cells. ,
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