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Figure 5.
Figure 5. (a) and (b) Ribbon drawing of the a-ring from A.
fulgidus in top and side view, respectively. The N-terminal
segments are shown in red and the remaining part is shown in
blue. (c) Stereo drawing of the open channel with a 7-fold
averaged 2F[O] -F[C] map showing the YDR element. Contacts among
residues of the YDR element in adjacent subunits are shown in
black. The carboxylate group of Asp9 forms a hydrogen bond with
the hydroxyl group of Tyr8 in the neighbouring a-subunit and
adopts a major part for the open axial channel. (d) Stereo
drawing of the closed channel of the a-ring from S. cerevisiae.
Contacts among residues of the YDR element in the a3 and a4
subunit, which maintain the regulatory gate in eukaryotes, are
shown in black sticks, whereas the N-terminal segments are
coloured in red.
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