Dpb11 Immuno-Precipitation Mass Spectrometry (IPMS) Data Related to Mec1/ATR Signaling Upon Hyper-Resection
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ABSTRACT: The Mec1/ATR kinase is crucial for genome maintenance, although the mechanisms by which it controls DNA repair pathways remain elusive. Here we uncovered a role for Mec1/ATR in controlling homologous recombination (HR) factors in response to hyper-resection of DNA ends. Cells lacking RAD9, a checkpoint activator and an inhibitor of resection, exhibit Mec1-dependent hyper-phosphorylation of proteins associated with single strand DNA transactions, including the ssDNA binding protein Rfa2, the translocase/ubiquitin ligase Uls1 and the HR-regulatory Sgs1-Top3-Rmi1 (STR) complex. Extensive Mec1-dependent phosphorylation of the STR complex, mostly on the Sgs1 helicase subunit, promotes an interaction between STR and the DNA repair scaffolding protein Dpb11. Fusion of Sgs1 to phosphopeptide-binding domains of Dpb11 strongly impairs HR-mediated repair, supporting a model whereby Mec1 promotes recruitment of STR to the 9-1-1 clamp via Dpb11 to regulate recombinogenic processes.
INSTRUMENT(S): Q Exactive HF
ORGANISM(S): Saccharomyces Cerevisiae (baker's Yeast)
SUBMITTER: Ethan Sanford
LAB HEAD: Marcus Smolka
PROVIDER: PXD017289 | Pride | 2021-03-10
REPOSITORIES: Pride
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