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Figure 4.
Figure 4. Comparison of NarX[S] and Tar Dimers
(A) Worm
representation of the dimeric aspartate receptor Tar, drawn in
stereo. Subunits A and B of Tar (Yeh et al., 1996) are colored
yellow and blue, respectively.
(B) Worm representation of
NarX[s1] dimers in stereo. A “Tar-like” NarX[s] dimer is
formed when subunits A (yellow) and B (blue) from
NarX[s1](NO[3]) are independently superimposed upon subunits A
and B of Tar, respectively. Subunit B from the natural NarX[s]
dimer of Figure 1 is shown in gray. The black vertical line
represents the quasi two-fold rotation axis of the observed
dimer. The red line shows the resulting axis of 9.3°
rotation that relates B subunits from the natural, observed
NarX[S]dimer and the constructed Tar-like NarX[s] dimer. In the
orientation of the molecules shown, the red rotation axis
intersects the black rotation axis and is angled approximately
30 degrees above the plane of the figure.
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