, Volume 23, Issue 5, pp 613–624 | Cite as

Endonucleases responsible for DNA repair of helix-distorting DNA lesions in the thermophilic crenarchaeon Sulfolobus acidocaldarius in vivo

  • Shoji Suzuki
  • Norio KurosawaEmail author
Original Paper


The DNA repair mechanisms of hyperthermophiles can provide important insights for understanding how genetic information is maintained under extreme environments. Recent biochemical studies have identified a novel endonuclease in hyperthermophilic archaea, NucS/EndoMS, that acts on branched DNA substrates and mismatched bases. NucS/EndoMS is thought to participate in the DNA repair of helix-distorting DNA lesions, including UV-induced DNA damage and DNA adducts, and mismatched bases; however, the specific in vivo role of NucS/EndoMS in hyperthermophilic archaeal DNA repair has not been reported. To explore the role of this protein, we knocked out the nucS/endoMS gene of the thermophilic crenarchaeon Sulfolobus acidocaldarius and characterized the mutant phenotypes. While the nucS/endoMS-deleted strain exhibited sensitivity to DNA adducts, it did not have high mutation rates or any sensitivity to UV irradiation. It has been proposed that the XPF endonuclease is involved in homologous recombination-mediated stalled-fork DNA repair. The xpf-deficient strain exhibited sensitivity to helix-distorting DNA lesions, but the sensitivity of the nucS/endoMS and xpf double knockout strain did not increase compared to that of the single knockout strains. We conclude that the endonuclease NucS/EndoMS works with XPF in homologous recombination-mediated stalled-fork DNA repair for the removal of helix-distorting DNA lesions in S. acidocaldarius.


Hyperthermophilic archaea Sulfolobus acidocaldarius DNA repair Helix-distorting DNA lesion NucS/EndoMS Stalled-fork DNA repair 



Hyperthermophilic archaea


Homologous recombination


Nucleotide excision repair


Mismatch repair


4-Nitroquinoline N-oxide


Supplementary material

792_2019_1120_MOESM1_ESM.pdf (334 kb)
Supplementary material 1 (PDF 333 kb)


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Copyright information

© Springer Japan KK, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Science and Engineering for Sustainable Development, Faculty of Science and EngineeringSoka UniversityTokyoJapan

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