zf-C2HE is an unusual zinc-binding domain found in fungi, plants and metazoa. It is often found at the C-terminus of HIT-domain-containing proteins, Pfam:PF01230. In fungi the fourth ligand is a Glu, in plants it is Cys and in metazoans it is usually a His. The fourth ligand is often mutated in neurogenerative disease-states [1].

1: Structure of an aprataxin-DNA complex with insights into AOA1 neurodegenerative disease. Tumbale P, Appel CD, Kraehenbuehl R, Robertson PD, Williams JS, Krahn J, Ahel I, Williams RS; Nat Struct Mol Biol. 2011;18:1189-1195. PMID:21984210