Figure 1.

Crystal structure of purN GAR transformylase complexed with β-GAR and N¹⁰-formyltetrahydrofolate. purN is shown bound to β-GAR (red) and N¹⁰-formyltetrahydrofolate (purple) and colored to show that the protein falls into two discrete domains—one responsible for binding GAR (green) and one domain that binds the N¹⁰-formyltetrahydrofolate (blue). The active site is at the interface between the two domains.