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431.
432.
《DNA Repair》2015
Among the set of mammalian DNA polymerases, DNA polymerases belonging to the X and Y families have a special place. The majority of these enzymes are involved in repair, including base excision repair and non-homologous end joining. Some of them play a crucial role during the specific process which is referred to as translesion synthesis (TLS). TLS intends for the cell surviving during the replication of damaged DNA templates. Additionally, specific activities of TLS-polymerases have to be useful for repair of double-stranded clustered lesions: if the synthesis is proceeded via base excision repair process, the role of DNA polymerases β or λ will be important. In this review we discussed the biochemical properties and functional relevance of X family DNA polymerases β and λ. 相似文献
433.
Uninterrupted replication across damaged DNA is critical to prevent replication fork collapse and resulting double-strand DNA breaks. Rad18-mediated PCNA ubiquitination is a crucial event that triggers a number of downstream pathways important for lesion bypass. Here, we report characterization of Spartan, an evolutionarily conserved protein containing a PCNA-interacting peptide motif, called a PIP box, and a UBZ4 ubiquitin-binding domain. Spartan is a nuclear protein and forms DNA damage-induced foci that colocalize with markers for stalled DNA replication. Focus formation of Spartan requires its PIP-box and the UBZ4 domain and is dependent on Rad18 and the PCNA ubiquitination site, indicating that Spartan is recruited to ubiquitinated PCNA. Spartan depletion results in increased mutagenesis during replication of UV-damaged DNA. Taken together, our data suggest that Spartan is recruited to sites of stalled replication via ubiquitinated PCNA and plays an important role to prevent mutations associated with replication of damaged DNA. 相似文献