This domain is found in NifU in combination with Pfam:PF01106. This domain is found on isolated in several bacterial species such as Swiss:O53156. The nif genes are responsible for nitrogen fixation. However this domain is found in bacteria that do not fix nitrogen, so it may have a broader significance in the cell than nitrogen fixation. These proteins appear to be scaffold proteins for iron-sulfur clusters [2].

1: A modular domain of NifU, a nitrogen fixation cluster protein, is highly conserved in evolution. Hwang DM, Dempsey A, Tan KT, Liew CC; J Mol Evol 1996;43:536-540. PMID:8875867

2: Components involved in assembly and dislocation of iron-sulfur clusters on the scaffold protein Isu1p. Muhlenhoff U, Gerber J, Richhardt N, Lill R; EMBO J 2003;22:4815-4825. PMID:12970193