D-inositol-3-phosphate glycosyltransferase (, mycothiol glycosyltransferases, MshA) is an enzyme with systematic name UDP-N-acetyl-D-glucosamine:1D-myo-inositol 3-phosphate alpha-D-glycosyltransferase. This enzyme catalyses the following chemical reaction
UDP-N-acetyl-D-glucosamine + 1D-myo-inositol 3-phosphate 1-O-(2-acetamido-2-deoxy-alpha-D-glucopyranosyl)-1D-myo-inositol 3-phosphate + UDP
This enzyme catalyses the first dedicated reaction in the biosynthesis of mycothiol.
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