Sgs1 Helicase and Two Nucleases Dna2 and Exo1 Resect DNA Double-Strand Break Ends
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منابع مشابه
Sgs1 Helicase and Two Nucleases Dna2 and Exo1 Resect DNA Double-Strand Break Ends
Formation of single-strand DNA (ssDNA) tails at a double-strand break (DSB) is a key step in homologous recombination and DNA-damage signaling. The enzyme(s) producing ssDNA at DSBs in eukaryotes remain unknown. We monitored 5'-strand resection at inducible DSB ends in yeast and identified proteins required for two stages of resection: initiation and long-range 5'-strand resection. We show that...
متن کاملRelationship of DNA degradation by Saccharomyces cerevisiae exonuclease 1 and its stimulation by RPA and Mre11-Rad50-Xrs2 to DNA end resection.
Homologous recombination is a major pathway for repair of DNA double-strand breaks. This repair process is initiated by resection of the 5′-terminated strand at the break site. In yeast, resection is carried out by three nucleolytic complexes: Mre11-Rad50-Xrs2, which functions at the initial step and also stimulates the two processive pathways, Sgs1-Dna2 and Exonuclease 1 (Exo1). Here we invest...
متن کاملThe 9-1-1 checkpoint clamp stimulates DNA resection by Dna2-Sgs1 and Exo1
Single-stranded DNA (ssDNA) at DNA ends is an important regulator of the DNA damage response. Resection, the generation of ssDNA, affects DNA damage checkpoint activation, DNA repair pathway choice, ssDNA-associated mutation and replication fork stability. In eukaryotes, extensive DNA resection requires the nuclease Exo1 and nuclease/helicase pair: Dna2 and Sgs1(BLM). How Exo1 and Dna2-Sgs1(BLM...
متن کاملProcessing of Dna Double-strand Break Ends and Telomere Ends in Fission Yeast
INTRODUCTION. DNA double-strand break (DSB) ends and telomere ends should be handled differently, because DSB ends should be joined, but telomere ends should not be joined. Recent studies have revealed that several proteins involved in DNA repair such as Mre11 complex and Ku heterodimer are also required for telomere maintenance. But how these proteins carry out different tasks at two different...
متن کاملEscape of Sgs1 from Rad9 inhibition reduces the requirement for Sae2 and functional MRX in DNA end resection.
Homologous recombination requires nucleolytic degradation (resection) of DNA double-strand break (DSB) ends. In Saccharomyces cerevisiae, the MRX complex and Sae2 are involved in the onset of DSB resection, whereas extensive resection requires Exo1 and the concerted action of Dna2 and Sgs1. Here, we show that the checkpoint protein Rad9 limits the action of Sgs1/Dna2 in DSB resection by inhibit...
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ژورنال
عنوان ژورنال: Cell
سال: 2008
ISSN: 0092-8674
DOI: 10.1016/j.cell.2008.08.037