May be a sulfotransferase involved in the formation of thiosulfate. hydrogen cyanide + thiosulfate = 2 H(+) + sulfite + thiocyanate The structure consists of 2 domains of very similar conformation, suggesting a common evolutionary origin. However, the sequences of the 2 domains are very different. Contains two rhodanese domains with different primary structures but with near identical secondary structure conformations suggesting a common evolutionary origin. Only the C-terminal rhodanese domain contains the catalytic cysteine residue (By similarity).