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Figure 3.
Figure 3. Structure of the Nsyx Domain(a) Superposition of
the backbone of the 15 simulated annealing structures with the
fewest violations from the NMR restraints. The three helices are
labeled HA, HB, and HC. The positions of the N and C termini, as
well as those of two residues in the loops (residues 69 and
108), are indicated. The backbone atoms of the three helices
(residues 28–62, 71–104, and 111–144) were used to
superimpose the structures.(b and c) Ribbon diagrams of the
structure of Nsyx in two different orientations. Helix A, B, and
C are colored in blue, green, and red, respectively. The
orientation in (c) results from a 90° rotation of the
structure in (b) (pulling the N terminus to the front) and
illustrates the left-handed twist of the bundle. The ribbon
diagrams were generated with the programs MOLSCRIPT ([29]) and
Raster3D ( [37]).
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