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The active site of AHAS II, based on the structure of the yeast AHAS–CIE complex (Protein Data Bank ID code 1N0H) (20). Trp-464 is shown in configuration A of Trp-586 in 1N0H. The residues are labeled with the numbering of AHAS II, and residues belonging to the second catalytic polypeptide are marked with ′. FAD is shown with thin gray bonds, and the enzyme is shown in the E-HEThDP·KB form. The software molscript (21) was used to make this figure.
