The HypF family of proteins are involved in the maturation and regulation of hydrogenase ([1]). In the N-terminus they appear to have two Zinc finger domains, as modelled by this family.

1: Rhodobacter capsulatus HypF is involved in regulation of hydrogenase synthesis through the HupUV proteins. Colbeau A, Elsen S, Tomiyama M, Zorin NA, Dimon B, Vignais PM; Eur J Biochem 1998;251:65-71. PMID:9492269