Replisome proximal protein associations and dynamic proteomic changes at stalled replication forks

Mol Cell Proteomics. 2024 Apr 12:100767. doi: 10.1016/j.mcpro.2024.100767. Online ahead of print.ABSTRACTDNA replication is a fundamental cellular process that ensures the transfer of genetic information during cell division. Genome duplication takes place in S phase and requires a dynamic and highly coordinated recruitment of multiple proteins at replication forks. Various genotoxic stressors lead to fork instability and collapse, hence the need for DNA repair pathways. By identifying the multitude of protein interactions implicated in those events we can better grasp the complex and dynamic molecular mechanisms that facilitate DNA replication and repair. Proximity-dependent biotin identification (BioID) was used to identify associations with 17 proteins within four core replication components, namely the CDC45/MCM2-7/GINS (CMG) helicase that unwinds DNA, the DNA polymerases, replication protein A subunits, and histone chaperones needed to disassemble and reassemble chromatin. We further investigated the impact of genotoxic stress on these interactions. This analysis revealed a vast proximity associations network with 108 nuclear proteins further modulated in the presence of hydroxyurea; 45 being enriched and 63 depleted. Interestingly, hydroxyurea treatment also caused a redistribution of associations with eleven interactors, meaning that the replisome is dynamically reorganized when stressed. The analysis identified several poorly characterized proteins, thereby uncovering...
Source: Molecular and Cellular Proteomics : MCP - Category: Molecular Biology Authors: Source Type: research