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DNA polymerase epsilon - more than a polymerase.

ScientificWorldJournal. 2003 Mar 24;3:87-104. doi:10.1100/tsw.2003.08
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摘要


This paper presents a comprehensive review of the structure and function of DNA polymerase epsilon. Together with DNA polymerases alpha and delta, this enzyme replicates the nuclear DNA in the eukaryotic cell. During this process, DNA polymerase alpha lays down RNA-DNA primers that are utilized by DNA polymerases delta and epsilon for the bulk DNA synthesis. Attempts have been made to assign these two enzymes specifically to the synthesis of the leading and the lagging strand. Alternatively, the two DNA polymerases may be needed to replicate distinct regions depending on chromatin structure. Surprisingly, the essential function of DNA polymerase epsilon does not depend on its catalytic activity, but resides in the nonenzymatic carboxy-terminal domain. This domain not only mediates the interaction of the catalytic subunit with the three smaller regulatory subunits, but also links the replication machinery to the S phase checkpoint. In addition to its role in DNA replication, DNA polymerase epsilon fulfils roles in the DNA synthesis step of nucleotide excision and base excision repair, and has been implicated in recombinational processes in the cell.

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