Formamidopyrimidine-DNA glycosylase (Fpg) is a DNA repair enzyme that excises oxidised purines from damaged DNA. This family is the N-terminal domain contains eight beta-strands, forming a beta-sandwich with two alpha-helices parallel to its edges [1].

1: Structure of formamidopyrimidine-DNA glycosylase covalently complexed to DNA. Gilboa R, Zharkov DO, Golan G, Fernandes AS, Gerchman SE, Matz E, Kycia JH, Grollman AP, Shoham G; J Biol Chem 2002;277:19811-19816. PMID:11912217