This domain is found in eukaryotes, and is approximately 70 amino acids in length. The family is found in association with Pfam:PF04042. There is a single completely conserved residue F that may be functionally important. This domain is the N terminal domain of DNA polymerase epsilon subunit B. It forms a primarily alpha helical structure in which four helices are arranged in two hairpins with connecting loops containing beta strands which form a short parallel sheet. DNA polymerase epsilon is required in DNA replication for synthesis of the leading strand. This domain has close structural relation to AAA+ protein C terminal domains.

1: The solution structure of the amino-terminal domain of human DNA polymerase epsilon subunit B is homologous to C-domains of AAA+ proteins. Nuutinen T, Tossavainen H, Fredriksson K, Pirila P, Permi P, Pospiech H, Syvaoja JE; Nucleic Acids Res. 2008;36:5102-5110. PMID:18676977