the following reaction:
:thiosulfate + cyanide sulfite + thiocyanate

Structure and mechanism

This reaction takes place in two steps. In the first step, thiosulfate is reduced by the thiol group on cysteine-247 1, to form a persulfide and a sulfite 2. In the second step, the persulfide reacts with cyanide to produce thiocyanate, re-generating the cysteine thiol

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