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The binding mode of NADP+. F o − F c OMIT map of bound NADP+. The catalytic cysteine (Cys322) and the Glu210 and Gly240 residues that anchor the 2′-phosphate group are shown in stick representation. The difference Fourier electron density is contoured at 3σ. The backbones of TtP5CDh–NADP, TtP5CDh–NAD and ligand-free TtP5CDh are colored green, grey and magenta, respectively. TtP5CDh–NAD and ligand-free TtP5CDh were superimposed on TtP5CDh–NADP.
