APE1 distinguishes DNA substrates in exonucleolytic cleavage by induced space-filling

Abstract

The exonuclease Apurinic/apyrimidinic endonuclease 1 (APE1) is important for processing matched/mismatched terminus during DNA repair. Here the authors resolve the X-ray crystallography structures of APE1 with varied dsDNAs substrates to assay the nuclease activity.