This domain family is found in bacteria, and is approximately 40 amino acids in length. The family is found in association with Pfam:PF03841. There is a single completely conserved residue P that may be functionally important. This family is the N terminal region of selenocysteine synthase which catalyses the conversion of seryl-tRNA(Sec) into selenocysteyl-tRNA(Sec).

1: Bacterial selenocysteine synthase--structural and functional properties. Tormay P, Wilting R, Lottspeich F, Mehta PK, Christen P, Bock A; Eur J Biochem. 1998;254:655-661. PMID:9688279