Mechanism of the ATP-dependent DNA end-resection machinery from Saccharomyces cerevisiae View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2010-09

AUTHORS

Hengyao Niu, Woo-Hyun Chung, Zhu Zhu, Youngho Kwon, Weixing Zhao, Peter Chi, Rohit Prakash, Changhyun Seong, Dongqing Liu, Lucy Lu, Grzegorz Ira, Patrick Sung

ABSTRACT

If not properly processed and repaired, DNA double-strand breaks (DSBs) can give rise to deleterious chromosome rearrangements, which could ultimately lead to the tumour phenotype. DSB ends are resected in a 5' to 3' fashion in cells, to yield single-stranded DNA (ssDNA) for the recruitment of factors critical for DNA damage checkpoint activation and repair by homologous recombination. The resection process involves redundant pathways consisting of nucleases, DNA helicases and associated proteins. Being guided by recent genetic studies, we have reconstituted the first eukaryotic ATP-dependent DNA end-resection machinery comprising the Saccharomyces cerevisiae Mre11-Rad50-Xrs2 (MRX) complex, the Sgs1-Top3-Rmi1 complex, Dna2 protein and the heterotrimeric ssDNA-binding protein RPA. Here we show that DNA strand separation during end resection is mediated by the Sgs1 helicase function, in a manner that is enhanced by Top3-Rmi1 and MRX. In congruence with genetic observations, although the Dna2 nuclease activity is critical for resection, the Mre11 nuclease activity is dispensable. By examining the top3 Y356F allele and its encoded protein, we provide evidence that the topoisomerase activity of Top3, although critical for the suppression of crossover recombination, is not needed for resection either in cells or in the reconstituted system. Our results also unveil a multifaceted role of RPA, in the sequestration of ssDNA generated by DNA unwinding, enhancement of 5' strand incision, and protection of the 3' strand. Our reconstituted system should serve as a useful model for delineating the mechanistic intricacy of the DNA break resection process in eukaryotes. More... »

PAGES

108

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/nature09318

DOI

http://dx.doi.org/10.1038/nature09318

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1027803050

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/20811460


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Download the RDF metadata as:  json-ld nt turtle xml License info

HOW TO GET THIS DATA PROGRAMMATICALLY:

JSON-LD is a popular format for linked data which is fully compatible with JSON.

curl -H 'Accept: application/ld+json' 'https://scigraph.springernature.com/pub.10.1038/nature09318'

N-Triples is a line-based linked data format ideal for batch operations.

curl -H 'Accept: application/n-triples' 'https://scigraph.springernature.com/pub.10.1038/nature09318'

Turtle is a human-readable linked data format.

curl -H 'Accept: text/turtle' 'https://scigraph.springernature.com/pub.10.1038/nature09318'

RDF/XML is a standard XML format for linked data.

curl -H 'Accept: application/rdf+xml' 'https://scigraph.springernature.com/pub.10.1038/nature09318'


 

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