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Cdc6
Cdc6, or cell division cycle 6, is a protein in eukaryotic cells that is studied in the budding yeast ''Saccharomyces cerevisiae''. It is an essential regulator of DNA replication and plays important roles in the activation and maintenance of the checkpoint mechanisms in the cell cycle that coordinate S phase and mitosis. It is part of the pre-replicative complex (pre-RC) and is required for loading mini chromosome maintenance (MCM) proteins onto the DNA, an essential step in the initiation of DNA synthesis. In addition, it’s a member of the family of AAA+ ATPases and highly associated to Orc1p.
== Function ==
Cdc6p is an ATP binding protein and a member of the pre-replicative complex (pre-RC) together with the origin recognition complex (ORC), Cdt1 and the MCM complex (containing MCM2-7p). Cdc6p assembles after ORC in an ATP dependent manner and is required for loading MCM proteins onto the DNA. Reconstruction of electron microscope images showed that the ORC-Cdc6p complex forms a ring-shaped structure with similar dimensions to those of ring-shaped MCM helicase.
It is thought that the Cdc6p-Cdt1 complex uses ATP hydrolysis to thread DNA through the central hole of the MCM doughnut. Mutations in the binding motif of Cdc6p strongly suggest that ATP binding and hydrolysis is essential for its function. The minimal requirement for DNA binding has been mapped within its 47-amino acid sequence. Furthermore, Cdc6 indirectly inhibits activation of the p34cdc2/CDC28 M phase kinase, thus nuclear division is suppressed.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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