Homologs of Rru_A2270 from Rhodospirillum rubrum S1H
Nitrogen-fixing NifU-like (NCBI)
SEED: Iron-sulfur cluster assembly scaffold protein NifU
46 hits from BLASTp (E < 0.01)
Or try PaperBLAST, fast.genomics, the ENIGMA genome browser, or the comparative fitness browser