Effect of the multifunctional proteins RPA, YB-1, and XPC repair factor on AP site cleavage by DNA glycosylase NEIL1

Abstract : DNA glycosylases are key enzymes in thefirst step of base excision DNA repair, recognizing DNA damage and catalyzingthe release of damaged nucleobases. Bifunctional DNA glycosylases also possess associated apurinic/apyrimidinic (AP)lyase activity that nick the damaged DNA strand at an abasic (or AP) site, formed either spontaneously or at thefirst stepof repair. NEIL1 is a bifunctional DNA glycosylase capable of processing lesions, including AP sites, not only in double-stranded but also in single-stranded DNA. Here, we show that proteins participating in DNA damage response, YB-1 andRPA, affect AP site cleavage by NEIL1. Stimulation of the AP lyase activity of NEIL1 was observed when an AP site waslocated in a 60nt-long double-stranded DNA. Both RPA and YB-1 inhibited AP site cleavage by NEIL1 when the AP sitewas located in single-stranded DNA. Taking into account a direct interaction of YB-1 with the AP site, located in single-stranded DNA, and the high affinity of both YB-1 and RPA for single-stranded DNA, this behavior is presumably aconsequence of a competition with NEIL1 for the DNA substrate. Xeroderma pigmentosum complementation groupC protein (XPC), a key protein of another DNA repair pathway, was shown to interact directly with AP sites but hadno effect on AP site cleavage by NEIL1.
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Submitted on : Thursday, September 19, 2019 - 3:35:22 PM
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Pavel Pestryakov, Dmitry Zharkov, Inga Grin, Elizaveta Fomina, Ekaterina Kim, et al.. Effect of the multifunctional proteins RPA, YB-1, and XPC repair factor on AP site cleavage by DNA glycosylase NEIL1. Journal of Molecular Recognition, Wiley, 2012, 25 (4), pp.224-233. ⟨10.1002/jmr.2182⟩. ⟨hal-02292246⟩

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