1. DNSN-1 recruits GINS for CMG helicase assembly during DNA replication initiation in Caenorhabditis elegans .
- Author
-
Xia Y, Sonneville R, Jenkyn-Bedford M, Ji L, Alabert C, Hong Y, Yeeles JTP, and Labib KPM
- Subjects
- Animals, Cell Cycle Proteins metabolism, Cryoelectron Microscopy, Chromosomal Proteins, Non-Histone genetics, Chromosomal Proteins, Non-Histone metabolism, Protein Domains, Caenorhabditis elegans genetics, Caenorhabditis elegans metabolism, DNA Replication, Minichromosome Maintenance Proteins chemistry, Minichromosome Maintenance Proteins genetics, Minichromosome Maintenance Proteins metabolism, Caenorhabditis elegans Proteins chemistry, Caenorhabditis elegans Proteins genetics, Caenorhabditis elegans Proteins metabolism
- Abstract
Assembly of the CMG (CDC-45-MCM-2-7-GINS) helicase is the key regulated step during eukaryotic DNA replication initiation. Until now, it was unclear whether metazoa require additional factors that are not present in yeast. In this work, we show that Caenorhabditis elegans DNSN-1, the ortholog of human DONSON, functions during helicase assembly in a complex with MUS-101/TOPBP1. DNSN-1 is required to recruit the GINS complex to chromatin, and a cryo-electron microscopy structure indicates that DNSN-1 positions GINS on the MCM-2-7 helicase motor (comprising the six MCM-2 to MCM-7 proteins), by direct binding of DNSN-1 to GINS and MCM-3, using interfaces that we show are important for initiation and essential for viability. These findings identify DNSN-1 as a missing link in our understanding of DNA replication initiation, suggesting that initiation defects underlie the human disease syndrome that results from DONSON mutations.
- Published
- 2023
- Full Text
- View/download PDF