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Information on EC 3.1.6.20 - S-sulfosulfanyl-L-cysteine sulfohydrolase

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EC Tree
     3 Hydrolases
         3.1 Acting on ester bonds
             3.1.6 Sulfuric-ester hydrolases
                3.1.6.20 S-sulfosulfanyl-L-cysteine sulfohydrolase
IUBMB Comments
Contains Mn2+. The enzyme is part of the Sox enzyme system, which participates in a bacterial thiosulfate oxidation pathway that produces sulfate. It catalyses two reactions in the pathway. In both cases the enzyme hydrolyses a sulfonate moiety that is bound (either directly or via a sulfane) to a cysteine residue of a SoxY protein, releasing sulfate. The enzyme from Paracoccus pantotrophus contains a pyroglutamate (cycloglutamate) at its N-terminus.
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The enzyme appears in viruses and cellular organisms
Reaction Schemes
[SoxY protein]-S-sulfosulfanyl-L-cysteine
+
=
[SoxY protein]-S-sulfanyl-L-cysteine
+
[SoxY protein]-S-(2-sulfodisulfanyl)-L-cysteine
+
=
[SoxY protein]-S-disulfanyl-L-cysteine
+
Synonyms
SoxB, sulfate thiol esterase, thiosulfohydrolase, more
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
[SoxY protein]-S-(2-sulfodisulfanyl)-L-cysteine + H2O = [SoxY protein]-S-disulfanyl-L-cysteine + sulfate
show the reaction diagram
(2)
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-
-
[SoxY protein]-S-sulfosulfanyl-L-cysteine + H2O = [SoxY protein]-S-sulfanyl-L-cysteine + sulfate
show the reaction diagram
(1)
-
-
-
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