Accepted name: thiosulfate—dithiol sulfurtransferase
Reaction: thiosulfate + dithioerythritol = sulfite + 4,5-cis-dihydroxy-1,2-dithiacyclohexane (i.e. oxidized dithioerythritol) + sulfide
Other name(s): thiosulfate reductase; TSR
Systematic name: thiosulfate:dithioerythritol sulfurtransferase
Comments: The enzyme from Chlorella shows very little activity towards monothiols such as glutathione and cysteine (cf. EC thiosulfate—thiolsulfurtransferase). The enzyme probably transfers the sulfur atom onto one thiol group to form -S-S-, and sulfide is spontaneously expelled from this by reaction with the other thiol group. May be identical with EC thiosulfate sulfurtransferase.
1.  Schmidt, A., Erdle, I. and Gamon, B. Isolation and characterization of thiosulfate reductases from the green alga Chlorella fusca. Planta 162 (1984) 243–249. [PMID: 24253096]
[EC created 1989, modified 1999]