XB-ART-57782
Mol Cell
2021 Feb 04;813:426-441.e8. doi: 10.1016/j.molcel.2021.01.004.
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Human DDK rescues stalled forks and counteracts checkpoint inhibition at unfired origins to complete DNA replication.
Jones MJK
,
Gelot C
,
Munk S
,
Koren A
,
Kawasoe Y
,
George KA
,
Santos RE
,
Olsen JV
,
McCarroll SA
,
Frattini MG
,
Takahashi TS
,
Jallepalli PV
.
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Eukaryotic genomes replicate via spatially and temporally regulated origin firing. Cyclin-dependent kinase (CDK) and Dbf4-dependent kinase (DDK) promote origin firing, whereas the S phase checkpoint limits firing to prevent nucleotide and RPA exhaustion. We used chemical genetics to interrogate human DDK with maximum precision, dissect its relationship with the S phase checkpoint, and identify DDK substrates. We show that DDK inhibition (DDKi) leads to graded suppression of origin firing and fork arrest. S phase checkpoint inhibition rescued origin firing in DDKi cells and DDK-depleted Xenopus egg extracts. DDKi also impairs RPA loading, nascent-strand protection, and fork restart. Via quantitative phosphoproteomics, we identify the BRCA1-associated (BRCA1-A) complex subunit MERIT40 and the cohesin accessory subunit PDS5B as DDK effectors in fork protection and restart. Phosphorylation neutralizes autoinhibition mediated by intrinsically disordered regions in both substrates. Our results reveal mechanisms through which DDK controls the duplication of large vertebrate genomes.
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Species referenced: Xenopus laevis
Genes referenced: brca1 dbf4 pds5b rpa1
GO keywords: replication fork [+]
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