Article ; Online: In silico protein interaction screening uncovers DONSON's role in replication initiation.
2023 Volume 381, Issue 6664, Page(s) eadi3448
Abstract: CDC45-MCM2-7-GINS (CMG) helicase assembly is the central event in eukaryotic replication initiation. In yeast, a multi-subunit "pre-loading complex" (pre-LC) accompanies GINS to chromatin-bound MCM2-7, leading to CMG formation. Here, we report that ... ...
Abstract | CDC45-MCM2-7-GINS (CMG) helicase assembly is the central event in eukaryotic replication initiation. In yeast, a multi-subunit "pre-loading complex" (pre-LC) accompanies GINS to chromatin-bound MCM2-7, leading to CMG formation. Here, we report that DONSON, a metazoan protein mutated in microcephalic primordial dwarfism, is required for CMG assembly in vertebrates. Using AlphaFold to screen for protein-protein interactions followed by experimental validation, we show that DONSON scaffolds a vertebrate pre-LC containing GINS, TOPBP1, and DNA pol ε. Our evidence suggests that DONSON docks the pre-LC onto MCM2-7, delivering GINS to its binding site in CMG. A patient-derived DONSON mutation compromises CMG assembly and recapitulates microcephalic dwarfism in mice. These results unify our understanding of eukaryotic replication initiation, implicate defective CMG assembly in microcephalic dwarfism, and illustrate how in silico protein-protein interaction screening accelerates mechanistic discovery. |
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MeSH term(s) | Animals ; Humans ; Mice ; Cell Cycle Proteins/genetics ; Cell Cycle Proteins/metabolism ; DNA Replication ; DNA-Binding Proteins/metabolism ; Minichromosome Maintenance Proteins/genetics ; Minichromosome Maintenance Proteins/metabolism ; Saccharomyces cerevisiae ; Saccharomyces cerevisiae Proteins ; Protein Interaction Mapping/methods ; Computer Simulation ; Nuclear Proteins/genetics ; Nuclear Proteins/metabolism ; Dwarfism/genetics ; Microcephaly/genetics ; Xenopus laevis |
Chemical Substances | Cell Cycle Proteins ; DNA-Binding Proteins ; Minichromosome Maintenance Proteins (EC 3.6.4.12) ; Saccharomyces cerevisiae Proteins ; Nuclear Proteins ; DONSON protein, human |
Language | English |
Publishing date | 2023-09-22 |
Publishing country | United States |
Document type | Journal Article |
ZDB-ID | 128410-1 |
ISSN | 1095-9203 ; 0036-8075 |
ISSN (online) | 1095-9203 |
ISSN | 0036-8075 |
DOI | 10.1126/science.adi3448 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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