Regulation of poly(ADP-Ribose) polymerase 1 activity by Y-Box-binding protein 1

Konstantin N. Naumenko, Mariya V. Sukhanova, Loic Hamon, Tatyana A. Kurgina, Elizaveta E. Alemasova, Mikhail M. Kutuzov, David Pastré, Olga I. Lavrik

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3 Citations (Scopus)


Y-box-binding protein 1 (YB-1) is a multifunctional positively charged protein that interacts with DNA or RNA and poly(ADP-ribose) (PAR). YB-1 is poly(ADP-ribosyl)ated and stimulates poly(ADP-ribose) polymerase 1 (PARP1) activity. Here, we studied the mechanism of YB-1-dependent PAR synthesis by PARP1 in vitro using biochemical and atomic force microscopy assays. PAR synthesis activity of PARP1 is known to be facilitated by co-factors such as Mg2+. However, in contrast to an Mg2+-dependent reaction, the activation of PARP1 by YB-1 is accompanied by overall up-regulation of protein PARylation and shortening of the PAR polymer. Therefore, YB-1 and cation co-factors stimulated PAR synthesis in divergent ways. PARP1 autoPARylation in the presence of YB-1 as well as trans-PARylation of YB-1 are greatly affected by the type of damaged DNA, suggesting that PARP1 activation depends on the formation of a PARP1–YB-1–DNA ternary complex. An unstructured C-terminal part of YB-1 involved in an interaction with PAR behaves similarly to full-length YB-1, indicating that both DNA and PAR binding are involved in the stimulation of PARP1 activity by YB-1. Thus, YB-1 is likely linked to the regulation of PARylation events in cells via an interaction with PAR and damaged DNA.

Original languageEnglish
Article number1325
Pages (from-to)1-26
Number of pages26
Issue number9
Publication statusPublished - 16 Sep 2020


  • Poly(ADP-ribose) polymerase 1
  • Protein poly(ADP-ribosyl)ation
  • Y-box-binding protein 1




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