This family contains proteins that have a domain related to the globular C-terminus of Frataxin the protein that is mutated in Friedreich's ataxia. This domain is found in a family of bacterial proteins. The function of this domain is currently unknown. It has been suggested that this family is involved in iron transport.

1: Friedreich's ataxia protein: phylogenetic evidence for mitochondrial dysfunction. Gibson TJ, Koonin EV, Musco G, Pastore A, Bork P; Trends Neurosci 1996;19:465-468. PMID:8931268