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Structural Basis for the Recruitment of Ctf18-RFC to the Replisome.

Structure. 2018 Jan 02;26(1):137-144.e3. Epub 2017 Dec 07
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摘要


Ctf18-RFC is an alternative PCNA loader which plays important but poorly understood roles in multiple DNA replication-associated processes. To fulfill its specialist roles, the Ctf18-RFC clamp loader contains a unique module in which the Dcc1-Ctf8 complex is bound to the C terminus of Ctf18 (the Ctf18-1-8 module). Here, we report the structural and functional characterization of the heterotetrameric complex formed between Ctf18-1-8 and a 63 kDa fragment of DNA polymerase ɛ. Our data reveal that Ctf18-1-8 binds stably to the polymerase and far from its other functional sites, suggesting that Ctf18-RFC could be associated with Pol ɛ throughout normal replication as the leading strand clamp loader. We also show that Pol ɛ and double-stranded DNA compete to bind the same winged-helix domain on Dcc1, with Pol ɛ being the preferred binding partner, thus suggesting that there are two alternative pathways to recruit Ctf18-RFC to sites of replication.

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