Fig. 35.
Function, structure and mechanism of ThiC. (a) The reaction catalyzed by ThiC. The fate of the AIR atoms is highlighted by balls and colors. (b) Active site structure of A. thaliana ThiC in complex with imidazole ribonucleotide and SAH. The mononuclear metal center is occupied by Zn2+. The unique Fe of the [4Fe–4S] cluster is ligated by a chloride ion. (c) Proposed mechanism of ThiC catalysis.