Reference: Perkins G and Diffley JF (1998) Nucleotide-dependent prereplicative complex assembly by Cdc6p, a homolog of eukaryotic and prokaryotic clamp-loaders. Mol Cell 2(1):23-32

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Abstract


Expression of the Cdc6 protein (Cdc6p) is essential for formation of prereplicative complexes at budding yeast replication origins. Analysis of mutations in the conserved nucleoside triphosphate (NTP)-binding site of Cdc6p described here suggests that NTPs are required both for the productive interaction of Cdc6p with replication origins during G1 and the quantitative loading of the Mcm2-7 family of proteins onto chromatin. We show that Cdc6p exhibits significant sequence similarity to subunits of eukaryotic and prokaryotic clamp-loaders, which load ring-shaped DNA polymerase processivity factors onto DNA in an analogous reaction. Similarities in both sequence and mechanism suggest that Cdc6p and the clamp-loaders are members of a superfamily of nucleotide-dependent loading factors.

Reference Type
Comparative Study | Journal Article
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Perkins G, Diffley JF
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