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  • Original Paper
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Phosphorylation of the DNA repair protein APE/REF-1 by CKII affects redox regulation of AP-1

Abstract

The DNA repair protein apurinic endonuclease (APE/Ref-1) exerts several physiological functions such as cleavage of apurinic/apyrimidinic sites and redox regulation of the transcription factor AP-1, whose activation is part of the cellular response to DNA damaging treatments. Here we demonstrate that APE/Ref-1 is phosphorylated by casein kinase II (CKII). This was shown for both the recombinant APE/Ref-1 protein (Km=0.55 mM) and for APE/Ref-1 expressed in COS cells. Phosphorylation of APE/Ref-1 did not alter the repair activity of the enzyme, whereas it stimulated its redox capability towards AP-1, thus promoting DNA binding activity of AP-1. Inhibition of CKII mediated phosphorylation of APE/Ref-1 blocked mutagen-stimulated increase in AP-1 binding. It also abrogated the induction of c-Jun protein and rendered cells more sensitive to induced DNA damage. Thus, phosphorylation of APE/Ref-1 appears to be involved in regulating the different physiological activities of the enzyme. CKII mediated phosphorylation of APE/Ref-1 and concomitant increase in AP-1 binding activity appears to be a novel mechanism of cellular stress response, forcing transcription of AP-1 target gene(s) the product(s) of which may exert protective function.

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Abbreviations

AP-1:

activator protein 1

APE/Ref-1:

apurinic/apyrimidinic endonuclease/redox factor 1

CKI:

casein kinase I

CKII:

casein kinase II

MMS:

methyl methanesulfonate

PKA:

protein kinase A

SDS:

sodium dodecylsulfate.

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Acknowledgements

We would like to thank Dr OG Issinger (Odense, Denmark) for generously providing the protein kinases CKII and CKI. Furthermore we would like to thank Dr Nastaincyk (Homburg, Germany) for his gift of the catalytic subunit of PKA, Dr S Mitra for APE cDNA, and C Kost for technical assistance. This work was supported by the Deutsche Forschungsgemeinschaft (Fr 1241/1-1 and SFB 519, B4) and the NMFZ Mainz.

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Fritz, G., Kaina, B. Phosphorylation of the DNA repair protein APE/REF-1 by CKII affects redox regulation of AP-1. Oncogene 18, 1033–1040 (1999). https://doi.org/10.1038/sj.onc.1202394

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