Found in clostridia, this protein contains one active site selenocysteine and catalyses the reductive deamination of glycine, which is coupled to the esterification of orthophosphate resulting in the formation of ATP [1]. A member of this family may also exist in Treponema denticola [2].

1: Selenoprotein A of the clostridial glycine reductase complex: purification and amino acid sequence of the selenocysteine-containing peptide. Sliwkowski MX, Stadtman TC; Proc Natl Acad Sci U S A 1988;85:368-371. PMID:2963330

2: Selenium-dependent growth of Treponema denticola: evidence for a clostridial-type glycine reductase. Rother M, Bock A, Wyss C; Arch Microbiol 2001;177:113-116. PMID:11797052