L cysteine:1D myo inositol 2 amino 2 deoxy alpha D glucopyranoside ligase

L-cysteine:1D-myo-inositol 2-amino-2-deoxy-alpha-D-glucopyranoside ligase (EC 6.3.1.13, MshC, MshC ligase, Cys:GlcN-Ins ligase, mycothiol ligase) is an enzyme with systematic name L-cysteine:1-O-(2-amino-2-deoxy-alpha-D-glucopyranosyl)-1D-myo-inositol ligase (AMP-forming). This enzyme catalyses the following chemical reaction

1-O-(2-amino-2-deoxy-alpha-D-glucopyranosyl)-1D-myo-inositol + L-cysteine + ATP ⇌ 1-O-[2-(L-cysteinamido)-2-deoxy-alpha-D-glucopyranosyl]-1D-myo-inositol + AMP + diphosphate

This enzyme is a key enzyme in the biosynthesis of mycothiol.