Y-box-binding protein 1 stimulates abasic site cleavage

E. E. Alemasova, K. N. Naumenko, N. A. Moor, O. I. Lavrik

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Apurinic/apyrimidinic (AP) sites are among the most frequent DNA lesions. The first step in the AP site repair involves the magnesium-dependent enzyme AP endonuclease 1 (APE1) that catalyzes hydrolytic cleavage of the DNA phosphodiester bond at the 5′ side of the AP site, thereby generating a single-strand DNA break flanked by the 3′-OH and 5′-deoxyribose phosphate (dRP) groups. Increased APE1 activity in cancer cells might correlate with tumor chemoresistance to DNA-damaging treatment. It has been previously shown that the multifunctional oncoprotein Y-box-binding protein 1 (YB-1) interacts with APE1 and inhibits APE1-catalyzed hydrolysis of AP sites in single-stranded DNAs. In this work, we demonstrated that YB-1 stabilizes the APE1 complex with double-stranded DNAs containing the AP sites and stimulates cleavage of these AP sites at low magnesium concentrations.

Original languageEnglish
Pages (from-to)1521-1528
Number of pages8
JournalBiochemistry (Moscow)
Issue number12
Publication statusPublished - 1 Dec 2017


  • AP endonuclease 1
  • apurinic/apyrimidinic site
  • base excision repair
  • Y-box-binding protein 1

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