This is an integral membrane protein. It is predicted to have a function in the transport of sulphur-containing molecules [1]. It contains several conserved glycines and an invariant cysteine that is probably an important functional residue.

1: PigS and PigP regulate prodigiosin biosynthesis in Serratia via differential control of divergent operons, which include predicted transporters of sulfur-containing molecules. Gristwood T, McNeil MB, Clulow JS, Salmond GP, Fineran PC; J Bacteriol. 2011;193:1076-1085. PMID:21183667