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. Author manuscript; available in PMC: 2018 Jul 10.
Published in final edited form as: EcoSal Plus. 2009 Aug;3(2):10.1128/ecosalplus.3.6.3.7. doi: 10.1128/ecosalplus.3.6.3.7

Figure 6.

Figure 6

(A) Reaction catalyzed by NifS. ThiS posttranslationally modified with an AMP on its C-terminus (ThiS-COAMP) and cysteine react to give thiocarboxylated ThiS (ThiS-COS−) alanine and AMP. (B) X-ray crystal structure of NifS. Protomer 1 is shown with blue helices and magenta strands, and protomer 2 is shown with red helices and yellow strands (PDB accession no. 1KMJ). (C) X-ray crystal structure of the NifS active site showing the environment around the PLP cofactor. PS, perselenocysteine; SC, selenocysteine.