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Figure 4.
Figure 4. Crystal Structure of the GCN4-pV Tetramer
(A)
Lateral view of the tetramer. Red van der Waals surfaces
identify residues at the a positions, green surfaces identify
residues at the d positions, and yellow surfaces identify
residues at the g positions. The N termini of helices A and B
are indicated.
(B) Axial view of the tetramer. The green,
yellow, and red van der Waals surfaces of the L6 (d), L30 (g),
and V31 (a) side chains are depicted.
(C) Cross-section of
the superhelix in the L20 (d) layer. The 2F[o] – F[c] electron
density map at 1.2σ contour is shown with the refined molecular
model.
(D) Superposition of the backbone conformations of
the parallel GCN4-pIL tetramer (red) and the antiparallel
GCN4-pA (green) and GCN4-pV (yellow) tetramers.
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