Mycoredoxin (, Mrx1, MrxI) is an enzyme with systematic name arseno-mycothiol:mycoredoxin oxidoreductase. This enzyme catalyses the following chemical reaction
arseno-mycothiol + mycoredoxin arsenite + mycothiol-mycoredoxin disulfide
Reduction of arsenate is part of a defense mechanism of the cell against toxic arsenate.
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