developmental stage:Present during G1 and early S phase of the cell cycle. Degraded during the late S , G2 , and M phases. ,Function:Cooperates with CDC6 to promote the loading of the mini-chromosome maintenance complex onto chromatin to form the pre-replication complex necessary to initiate DNA replication. Binds DNA in a sequence- , strand- , and conformation-independent manner. Potential oncogene. ,PTM:Phosphorylated by cyclin A-dependent kinases which results in the binding of CDT1 to the F-box protein SKP2 and subsequent degradation. Binding to GMNN is not affected by phosphorylation. ,PTM:Ubiquitinated , leading to its subsequent degradation. The interaction with GMNN protects it against ubiquitination. ,similarity:Belongs to the Cdt1 family. ,subunit:Interaction with GMNN inhibits both binding of the MCM complex to origins of replication and DNA-binding activity. ,
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