Catalytic Intermediate Crystal Structures of Cysteine Desulfurase from the Archaeon Thermococcus onnurineus NA1

Figure 5

Comparison of ToCDS and XometC catalytic intermediate structures. (a) Superimposed ToCDS NAT (cyan) and GD (yellow) structures with nearby residues. (b) Superimposed XometC NAT (cyan) and external aldimine with alanine (purple) structures with nearby residues. (c) Active site structure of ToCDS PSF. The 2Fo-Fc electron density map is contoured at 1.0 σ (blue).

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(b)

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