N- and C-terminal extensions are predicted to be disordered and solvent exposed. (A – C) Plots of DisEMBL Remark 465, hot loops, and loop index values. Red dashed lines indicate amino acid positions over the default threshold. (D) RMSD fluctuation average per amino acid for the backbone atoms of the NaTrxh model during the last 2.5 ns of MD simulation. (E) Cartoon of the NaTrxh final model relaxed with ROSETTA fast-relax. Segments were colored according to Figure 2A. The glassy shades indicate areas predicted as highly mobile, according to the plot in D; image prepared with VMD .