The Ubiquitin Ligase TRAIP: Double-Edged Sword at the Replisome

In preparation for cell division, the genome must be copied with high fidelity. However, replisomes often encounter obstacles, including bulky DNA lesions caused by reactive metabolites and chemotherapeutics, as well as stable nucleo-protein complexes. Here, we discuss recent advances in our understanding of TRAIP, a replisome-associated E3 ubiquitin ligase that ismutated inmicrocephalic primordial dwarfism. In interphase, TRAIP helps replisomes overcome DNA interstrand crosslinks and DNA-protein crosslinks, whereas in mitosis it triggers disassembly of all replisomes that remain on chromatin. We describe a model to explain how TRAIP performs these disparate functions and how they help maintain genome integrity.

Automated summary

This article discusses the functions of the replisome-associated E3 ubiquitin ligase TRAIP, which plays different roles before and after cell division, helping cells overcome DNA damage and maintain genome integrity.