The human AP-endonuclease (APE1/Ref-1), an essential multifunctional protein involved in repair of oxidative DNA damage as well as in transcriptional regulation, is often overexpressed in tumor cells. of p21. Interestingly, APE1 and AP4 showed mutual dependence for p21 repression. Moreover, ectopic p53 in p53-null cells inhibited AP4s association with APE1, their binding to the promoter… Continue reading The human AP-endonuclease (APE1/Ref-1), an essential multifunctional protein involved in repair