Abstract
In G1, two copies of the MCM2-7 helicase are recruited to each origin of replication. Whereas recruitment of the first MCM2-7 is likely to be analogous to the loading of sliding clamps around DNA, how the second MCM2-7 complex is recruited is highly contentious. Here, we argue that MCM2-7 loading involves specific modifications to the clamp-loading reaction and propose that the first and second MCM2-7 molecules are loaded via similar mechanisms.
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