Journal
JOURNAL OF CELL BIOLOGY
Volume 212, Issue 3, Pages 281-288Publisher
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.201507042
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Funding
- European Community's Seventh Framework Programme (project DDResponse)
- Kraeftens Bekaempelse
- Lundbeckfonden [R93-A8990]
- Sundhed og Sygdom, Det Frie Forskningsrad [DFF-1331-00262]
- Novo Nordisk UK Research Foundation [NNF14CC0001, NN13331]
- Danmarks Grundforskningsfond (Center of Excellence: CARD)
- Norway Grants (project PHOSCAN) [7F14061]
- Vetenskapsradet
- Kellner Familly Foundation
- Intra-European Fellowship (FP7-PEOPLE-IEF) [303269]
- Lundbeck Foundation [R93-2011-8990] Funding Source: researchfish
- Novo Nordisk Fonden [NNF12OC0002290, NNF15OC0016584] Funding Source: researchfish
- Novo Nordisk Foundation Center for Protein Research [PI Jiri Lukas] Funding Source: researchfish
- The Danish Cancer Society [R124-A7785] Funding Source: researchfish
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Topoisomerase II beta-binding protein 1 (TOPBP1) participates in DNA replication and DNA damage response; however, its role in DNA repair and relevance for human cancer remain unclear. Here, through an unbiased small interfering RNA screen, we identified and validated TOPBP1 as a novel determinant whose loss sensitized human cells to olaparib, an inhibitor of poly(ADP-ribose) polymerase. We show that TOPBP1 acts in homologous recombination (HR) repair, impacts olaparib response, and exhibits aberrant patterns in subsets of human ovarian carcinomas. TOPBP1 depletion abrogated RAD51 loading to chromatin and formation of RAD51 foci, but without affecting the upstream HR steps of DNA end resection and RPA loading. Furthermore, TOPBP1 BRCT domains 7/8 are essential for RAD51 foci formation. Mechanistically, TOPBP1 physically binds PLK1 and promotes PLK1 kinase-mediated phosphorylation of RAD51 at serine 14, a modification required for RAD51 recruitment to chromatin. Overall, our results provide mechanistic insights into TOPBP1's role in HR, with potential clinical implications for cancer treatment.
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