Proteomics

Dataset Information

0

Human U2OS DNApk GLASS-ChIP LC-MS/MS


ABSTRACT: The Mre11-Rad50-Nbs1 (MRN) complex recognizes and processes DNA double-strand breaks for homologous recombination by performing short-range removal of 5ʹ strands. Endonucleolytic processing by MRN requires a stably bound protein at the break site—a role we postulate is played by DNA-dependent protein kinase (DNA-PK) in mammals. Here we interrogate sites of MRN-dependent processing by identifying sites of CtIP association and by sequencing DNA- PK-bound DNA fragments that are products of MRN cleavage. These intermediates are generated most efficiently when DNA-PK is catalytically blocked, yielding products within 200 bp of the break site, whereas DNA-PK products in the absence of kinase inhibition show greater dispersal. Use of light-activated Cas9 to induce breaks facilitates temporal resolution of DNA- PK and Mre11 binding, showing that both complexes bind to DNA ends before release of DNA- PK-bound products. These results support a sequential model of double-strand break repair involving collaborative interactions between homologous and non-homologous repair complexes.

INSTRUMENT(S): Orbitrap Fusion

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Permanent Cell Line Cell, Cell Culture

SUBMITTER: Nicolette Ender  

LAB HEAD: Tanya T. Paull

PROVIDER: PXD045033 | Pride | 2023-10-24

REPOSITORIES: Pride

Dataset's files

Source:
Action DRS
20201117_DNApkcs_new_Glass_CHIP_pkcs_normalized_no_modification.msf Msf
20210324_DNApkcs_new_Glass_CHIP_pkcs_normalized_no_modification.msf Msf
7960_NE_1.raw Raw
7960_NE_3.raw Raw
7960_NE_4.raw Raw
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Publications

Genome-wide analysis of DNA-PK-bound MRN cleavage products supports a sequential model of DSB repair pathway choice.

Deshpande Rajashree A RA   Marin-Gonzalez Alberto A   Barnes Hannah K HK   Woolley Phillip R PR   Ha Taekjip T   Paull Tanya T TT  

Nature communications 20230916 1


The Mre11-Rad50-Nbs1 (MRN) complex recognizes and processes DNA double-strand breaks for homologous recombination by performing short-range removal of 5' strands. Endonucleolytic processing by MRN requires a stably bound protein at the break site-a role we postulate is played by DNA-dependent protein kinase (DNA-PK) in mammals. Here we interrogate sites of MRN-dependent processing by identifying sites of CtIP association and by sequencing DNA-PK-bound DNA fragments that are products of MRN cleav  ...[more]

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