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Science December 22, 2000; 290 (5500): 2309-12.

Inhibition of eukaryotic DNA replication by geminin binding to Cdt1.

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

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.

PubMed ID: 11125146
Article link: Science
Grant support: [+]

Species referenced: Xenopus laevis
Genes referenced: cdt1 gmnn mmut

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