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Thesis Title: Subtitle - NMR Spectroscopy Research Group

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92 Chapter 3. Numbat: new user-friendly method built for automatic Δχ-tensor determination.<br />

3.8 Conclusion<br />

Figure 3.4 The four degenerate solutions arising from the symmetry of the<br />

Δχ-tensor around the x, y and z axes. All four possibilities result in the same<br />

calculi of PCS, hence in the same isosurfaces.<br />

Figure 3.5 The complex between ε186 and θ determined by superimposition<br />

of Δχ-tensors. The ε186/HOT complex (PDB accession code 2IDO) is shown<br />

for reference, with ε186 coloured in silver and HOT (residues 9-66) in<br />

orange. The isosurfaces correspond to the PCS induced by the Dy 3+ ion<br />

(from individual optimisation) contoured at +/-1.5 ppm and +/-0.5 ppm.<br />

Blue and red isosurfaces represent regions with positive and negative PCS,<br />

respectively. Residues 9-66 of θ are shown as a thin ribbon in the position<br />

defined by the fixed Dy 3+ and Er 3+ data (brown).<br />

The program Numbat is the first software package for fitting Δχ-tensors from PCS data with<br />

a user-friendly graphical user interface (GUI). Numbat calculations are fast, as it was written with<br />

open-source Linux routines in C. While the main task of Numbat is the fit of the eight Δχ-tensor

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