Abstract:
:DNA damage leads to genome instability by interfering with DNA replication. Cells possess several damage bypass pathways that mitigate the effects of DNA damage during replication. These pathways include translesion synthesis and template switching. These pathways are regulated largely through post-translational modifications of proliferating cell nuclear antigen (PCNA), an essential replication accessory factor. Mono-ubiquitylation of PCNA promotes translesion synthesis, and K63-linked poly-ubiquitylation promotes template switching. This article will discuss the mechanisms of how these post-translational modifications of PCNA control these bypass pathways from a structural and biochemical perspective. We will focus on the structure and function of the E3 ubiquitin ligases Rad18 and Rad5 that facilitate the mono-ubiquitylation and poly-ubiquitylation of PCNA, respectively. We conclude by reviewing alternative ideas about how these post-translational modifications of PCNA regulate the assembly of the multi-protein complexes that promote damage bypass pathways.
journal_name
Genes (Basel)journal_title
Genesauthors
Ripley BM,Gildenberg MS,Washington MTdoi
10.3390/genes11020138subject
Has Abstractpub_date
2020-01-29 00:00:00issue
2issn
2073-4425pii
genes11020138journal_volume
11pub_type
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