This family contains one sequence of known function Human mitochondrial transcription termination factor (mTERF) the rest of the family consists of hypothetical proteins none of which have any functional information. mTERF is a multizipper protein possessing three putative leucine zippers one of which is bipartite. The protein binds DNA as a monomer [1]. The leucine zippers are not implicated in a dimerisation role as in other leucine zippers [1].

1: The human mitochondrial transcription termination factor (mTERF) is a multizipper protein but binds to DNA as a monomer, with evidence pointing to intramolecular leucine zipper interactions. Fernandez-Silva P, Martinez-Azorin F, Micol V, Attardi G; EMBO J 1997;16:1066-1079. PMID:9118945