acid-ammonia (or amide) ligase activity cysteine-glucosaminylinositol ligase activity https://github.com/geneontology/go-ontology/issues/28183 https://github.com/geneontology/go-ontology/issues/30193 GO:0035446 MetaCyc:RXN1G-121 MshC ligase L-cysteine:1D-myo-inositol 2-amino-2-deoxy-alpha-D-glucopyranoside ligase 2010-04-14T11:33:06Z EC:6.3.1.13 RHEA:26176 Catalysis of the reaction: 1-(2-amino-2-deoxy-alpha-D-glucopyranoside)-1D-myo-inositol + L-cysteine + ATP = 1-D-myo-inosityl-2-L-cysteinylamido-2-deoxy-alpha-D-glucopyranoside + AMP + diphosphate + 2 H+. 1-(2-amino-2-deoxy-alpha-D-glucopyranoside)-1D-myo-inositol is also known as glucosaminyl-inositol or GlcN-Ins, and 1-D-myo-inosityl-2-L-cysteinylamido-2-deoxy-alpha-D-glucopyranoside as desacetylmycothiol or Cys-GlcN-Ins. desacetylmycothiol synthase bf molecular_function