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XB-ART-9806
Science 2000 Dec 22;2905500:2309-12. doi: 10.1126/science.290.5500.2309.
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Inhibition of eukaryotic DNA replication by geminin binding to Cdt1.

Wohlschlegel JA , Dwyer BT , Dhar SK , Cvetic C , Walter JC , Dutta A .


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In all eukaryotic organisms, inappropriate firing of replication origins during the G2 phase of the cell cycle is suppressed by cyclin-dependent kinases. Multicellular eukaryotes contain a second putative inhibitor of re-replication called geminin. Geminin is believed to block binding of the mini-chromosome maintenance (MCM) complex to origins of replication, but the mechanism of this inhibition is unclear. Here we show that geminin interacts tightly with Cdt1, a recently identified replication initiation factor necessary for MCM loading. The inhibition of DNA replication by geminin that is observed in cell-free DNA replication extracts is reversed by the addition of excess Cdt1. In the normal cell cycle, Cdt1 is present only in G1 and S, whereas geminin is present in S and G2 phases of the cell cycle. Together, these results suggest that geminin inhibits inappropriate origin firing by targeting Cdt1.

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Species referenced: Xenopus
Genes referenced: cdt1 gmnn mmut

References :
Lygerou, Cell cycle. License withheld--geminin blocks DNA replication. 2000, Pubmed, Xenbase