DNA Polymerization-independent Functions of DNA Polymerase Epsilon in Assembly and Progression of the Replisome in Fission Yeast

Overview

Journal Mol Biol Cell

Specialties Cell Biology
Molecular Biology

Date 2012 Jun 22

PMID 22718908

Citations 26

Authors

Tetsuya Handa

Mai Kanke

Tatsuro S Takahashi

Takuro Nakagawa

Hisao Masukata

Affiliations

Soon will be listed here.

Abstract

DNA polymerase epsilon (Pol ε) synthesizes the leading strands, following the CMG (Cdc45, Mcm2-7, and GINS [Go-Ichi-Nii-San]) helicase that translocates on the leading-strand template at eukaryotic replication forks. Although Pol ε is essential for the viability of fission and budding yeasts, the N-terminal polymerase domain of the catalytic subunit, Cdc20/Pol2, is dispensable for viability, leaving the following question: what is the essential role(s) of Pol ε? In this study, we investigated the essential roles of Pol ε using a temperature-sensitive mutant and a recently developed protein-depletion (off-aid) system in fission yeast. In cdc20-ct1 cells carrying mutations in the C-terminal domain of Cdc20, the CMG components, RPA, Pol α, and Pol δ were loaded onto replication origins, but Cdc45 did not translocate from the origins, suggesting that Pol ε is required for CMG helicase progression. In contrast, depletion of Cdc20 abolished the loading of GINS and Cdc45 onto origins, indicating that Pol ε is essential for assembly of the CMG complex. These results demonstrate that Pol ε plays essential roles in both the assembly and progression of CMG helicase.

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