This domain family is found in bacteria, eukaryotes and viruses, and is approximately 60 amino acids in length. The family is found in association with Pfam:PF00884. There are two completely conserved residues (R and W) that may be functionally important. This family is the C terminal of choline sulfatase, the enzyme responsible for catalysing the conversion of choline-O-sulfate and, at a lower rate, phosphorylcholine, into choline.

1: Presence of a gene encoding choline sulfatase in Sinorhizobium meliloti bet operon: choline-O-sulfate is metabolized into glycine betaine. Osteras M, Boncompagni E, Vincent N, Poggi MC, Le Rudulier D; Proc Natl Acad Sci U S A. 1998;95:11394-11399. PMID:9736747