MCM8IP activates the MCM8-9 helicase to promote DNA synthesis and homologous recombination upon DNA damage.

Homologous recombination (HR) mediates the error-free repair of DNA double-strand breaks to maintain genomic stability. Here we characterize C17orf53/MCM8IP, an OB-fold containing protein that binds ssDNA, as a DNA repair factor involved in HR. MCM8IP-deficient cells exhibit HR defects, especially in long-tract gene conversion, occurring downstream of RAD51 loading, consistent ...
with a role for MCM8IP in HR-dependent DNA synthesis. Moreover, loss of MCM8IP confers cellular sensitivity to crosslinking agents and PARP inhibition. Importantly, we report that MCM8IP directly associates with MCM8-9, a helicase complex mutated in primary ovarian insufficiency, and RPA1. We additionally show that the interactions of MCM8IP with MCM8-9 and RPA facilitate HR and promote replication fork progression and cellular viability in response to treatment with crosslinking agents. Mechanistically, MCM8IP stimulates the helicase activity of MCM8-9. Collectively, our work identifies MCM8IP as a key regulator of MCM8-9-dependent DNA synthesis during DNA recombination and replication.
Mesh Terms:
Cell Line, Tumor, Cell Survival, Chromatin, DNA Damage, DNA Replication, DNA, Single-Stranded, DNA-Binding Proteins, HCT116 Cells, HEK293 Cells, Humans, Minichromosome Maintenance Proteins, Mutation, Protein Binding, Rad51 Recombinase, Recombinational DNA Repair, Replication Protein A
Nat Commun
Date: Dec. 11, 2019
Download Curated Data For This Publication
234934
Switch View:
  • Interactions 33