label: class I DNA-(apurinic or apyrimidinic site) endonuclease activity
label_lc: class i dna-(apurinic or apyrimidinic site) endonuclease activity
description: "Catalysis of the cleavage of an AP site 3' of the baseless site by a beta-lyase mechanism, leaving an unsaturated aldehyde, termed a 3'-(4-hydroxy-5-phospho-2-pentenal) residue, and a 5'-phosphate."