The SOSS1 single-stranded DNA binding complex promotes DNA end resection in concert with Exo1

Soo Hyun Yang, Ruobo Zhou, Judith Campbell, Junjie Chen, Taekjip Ha, Tanya T. Paull

Research output: Contribution to journalArticle

Abstract

The human SSB homologue 1 (hSSB1) has been shown to facilitate homologous recombination and double-strand break signalling in human cells. Here, we compare the DNA-binding properties of the SOSS1 complex, containing SSB1, with Replication Protein A (RPA), the primary single-strand DNA (ssDNA) binding complex in eukaryotes. Ensemble and single-molecule approaches show that SOSS1 binds ssDNA with lower affinity compared to RPA, and exhibits less stable interactions with DNA substrates. Nevertheless, the SOSS1 complex is uniquely capable of promoting interaction of human Exo1 with double-strand DNA ends and stimulates its activity independently of the MRN complex in vitro. Both MRN and SOSS1 also act to mitigate the inhibitory action of the Ku70/80 heterodimer on Exo1 activity in vitro. These results may explain why SOSS complexes do not localize with RPA to replication sites in human cells, yet have a strong effect on double-strand break resection and homologous recombination.

Original languageEnglish (US)
Pages (from-to)126-139
Number of pages14
JournalEMBO Journal
Volume32
Issue number1
DOIs
StatePublished - Jan 9 2013
Externally publishedYes

Fingerprint

Single-Stranded DNA
Replication Protein A
DNA
Homologous Recombination
Cells
Eukaryota
Molecules
Substrates
In Vitro Techniques

Keywords

  • DNA repair; resection; RPA; single-stranded DNA

ASJC Scopus subject areas

  • Molecular Biology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)
  • Neuroscience(all)

Cite this

The SOSS1 single-stranded DNA binding complex promotes DNA end resection in concert with Exo1. / Yang, Soo Hyun; Zhou, Ruobo; Campbell, Judith; Chen, Junjie; Ha, Taekjip; Paull, Tanya T.

In: EMBO Journal, Vol. 32, No. 1, 09.01.2013, p. 126-139.

Research output: Contribution to journalArticle

Yang, Soo Hyun ; Zhou, Ruobo ; Campbell, Judith ; Chen, Junjie ; Ha, Taekjip ; Paull, Tanya T. / The SOSS1 single-stranded DNA binding complex promotes DNA end resection in concert with Exo1. In: EMBO Journal. 2013 ; Vol. 32, No. 1. pp. 126-139.
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