Document Detail

Visualization of a DNA-PK/PARP1 complex.
MedLine Citation:
PMID:  22223246     Owner:  NLM     Status:  MEDLINE    
The DNA-dependent protein kinase (DNA-PK) and Poly(ADP-ribose) polymerase-1 (PARP1) are critical enzymes that reduce genomic damage caused by DNA lesions. They are both activated by DNA strand breaks generated by physiological and environmental factors, and they have been shown to interact. Here, we report in vivo evidence that DNA-PK and PARP1 are equally necessary for rapid repair. We purified a DNA-PK/PARP1 complex loaded on DNA and performed electron microscopy and single particle analysis on its tetrameric and dimer-of-tetramers forms. By comparison with the DNA-PK holoenzyme and fitting crystallographic structures, we see that the PARP1 density is in close contact with the Ku subunit. Crucially, PARP1 binding elicits substantial conformational changes in the DNA-PK synaptic dimer assembly. Taken together, our data support a functional, in-pathway role for DNA-PK and PARP1 in double-strand break (DSB) repair. We also propose a NHEJ model where protein-protein interactions alter substantially the architecture of DNA-PK dimers at DSBs, to trigger subsequent interactions or enzymatic reactions.
Laura Spagnolo; Jody Barbeau; Nicola J Curtin; Edward P Morris; Laurence H Pearl
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-01-05
Journal Detail:
Title:  Nucleic acids research     Volume:  40     ISSN:  1362-4962     ISO Abbreviation:  Nucleic Acids Res.     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-05-14     Completed Date:  2012-07-17     Revised Date:  2013-06-26    
Medline Journal Info:
Nlm Unique ID:  0411011     Medline TA:  Nucleic Acids Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  4168-77     Citation Subset:  IM    
Cancer Research UK DNA Repair Enzymes Group, The Institute of Cancer Research, London SW3 6JB, UK.
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MeSH Terms
Cells, Cultured
DNA Breaks, Double-Stranded
DNA Repair*
DNA-Activated Protein Kinase / chemistry,  physiology,  ultrastructure*
DNA-Binding Proteins / physiology
Nuclear Proteins / chemistry,  physiology,  ultrastructure*
Poly(ADP-ribose) Polymerases / chemistry,  physiology,  ultrastructure*
Grant Support
087658//Wellcome Trust; 087658/Z/08/Z//Wellcome Trust; C17335/A10470//Cancer Research UK
Reg. No./Substance:
0/DNA-Binding Proteins; 0/Nuclear Proteins; EC protein, human; EC protein, mouse; EC Polymerases; EC Protein Kinase; EC protein, human; EC protein, mouse

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