Shuttling along DNA and directed processing of D-loops by RecQ helicase support quality control of homologous recombination

Gábor M. Harami, Yeonee Seol, Junghoon In, Veronika Ferencziová, Máté Martina, Máté Gyimesi, Kata Sarlós, Zoltán J. Kovács, Nikolett T. Nagy, Yuze Sun, T. Vellai, Keir C. Neuman, Mihály Kovács

Research output: Contribution to journalArticle

14 Citations (Scopus)


Cells must continuously repair inevitable DNA damage while avoiding the deleterious consequences of imprecise repair. Distinction between legitimate and illegitimate repair processes is thought to be achieved in part through differential recognition and processing of specific noncanonical DNA structures, although the mechanistic basis of discrimination remains poorly defined. Here, we show that Escherichia coli RecQ, a central DNA recombination and repair enzyme, exhibits differential processing of DNA substrates based on their geometry and structure. Through single-molecule and ensemble biophysical experiments, we elucidate how the conserved domain architecture of RecQ supports geometry-dependent shuttling and directed processing of recombination-intermediate [displacement loop (D-loop)] substrates. Our study shows that these activities together suppress illegitimate recombination in vivo, whereas unregulated duplex unwinding is detrimental for recombination precision. Based on these results, we propose a mechanism through which RecQ helicases achieve recombination precision and efficiency.

Original languageEnglish
Pages (from-to)E466-E475
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number4
Publication statusPublished - Jan 24 2017


  • DNA unwinding
  • Helicase
  • Magnetic tweezers
  • RecQ
  • Single molecule

ASJC Scopus subject areas

  • General

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