This entry includes a group of putative selenoproteins from Proteobacteria, Actinobacteria and Firmicutes. The invariant cysteine at the C terminus is encoded by a TGA Sec codon in some Epsilonproteobacteria, suggesting a redox activity for the protein[2]. Some members of this family have been suggested to be required for pyruvate transport in diverse bacteria, along with a CstA-like transporter found adjacent in the genome (see Supplementary note 5 in [3].)

1: Ab Initio Modeling Led Annotation Suggests Nucleic Acid Binding Function for Many DUFs. Rigden DJ; OMICS 2011;0:0-0. PMID:21348639

2: Evolution of the Selenoproteome in Helicobacter pylori and Epsilonproteobacteria. Cravedi P, Mori G, Fischer F, Percudani R; Genome Biol Evol. 2015;7:2692-2704. PMID:26342139

3: Mutant phenotypes for thousands of bacterial genes of unknown function. Price MN, Wetmore KM, Waters RJ, Callaghan M, Ray J, Liu H, Kuehl JV, Melnyk RA, Lamson JS, Suh Y, Carlson HK, Esquivel Z, Sadeeshkumar H, Chakraborty R, Zane GM, Rubin BE, Wall JD, Visel A, Bristow J, Blow MJ, Arkin AP, Deutschbauer AM; Nature. 2018;557:503-509. PMID:29769716