[mycoredoxin]-L-cysteine + arseno-mycothiol + H(+) => [mycoredoxin]-S-mycothiol-L-cysteine + arsenite
[mycoredoxin]-l-cysteine + arseno-mycothiol + h(+) => [mycoredoxin]-s-mycothiol-l-cysteine + arsenite
[mycoredoxin]-L-cysteine + arseno-mycothiol + H(+) => [mycoredoxin]-S-mycothiol-L-cysteine + arsenite
[mycoredoxin]-l-cysteine + arseno-mycothiol + h(+) => [mycoredoxin]-s-mycothiol-l-cysteine + arsenite