Mycothione reductase () is an enzyme that catalyzes the chemical reaction
mycothione + NAD(P)H + H+ 2 mycothiol + NADP+
in M. tuberculosis and other actinomycetes.
The two substrates of this enzyme are mycothione and reduced nicotinamide adenine dinucleotide phosphate (NADPH). The products are two molecules of mycothiol and one of NADP+.
This enzyme belongs to the family of oxidoreductases, specifically those acting on a sulfur group of donors with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is mycothiol:NAD(P)+ oxidoreductase. This enzyme is also called mycothiol-disulfide reductase.
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