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Figure 2.
Figure 2. Unusually flat surface of bet3. (a) Ribbon drawing
looking down the molecular two-fold axis, which runs
perpendicular to the orientation of bet3 in Figure 1a.
Myristoyl-Cys68 is a CPK model. The acidic or basic residues
exposed on the surface are in ball-and-stick form. The flexible
portion of loop  2-
3
is red. The coordinates of a completely disordered residue,
Arg67, should be considered unfixed. (b) Electrostatic surface
representation. The orientation of the molecule is the same as
in a. The positive and negative charges arising from the
indicated residues in a are in blue and red, respectively.
Circles, positions of the entryway to the channel on each
subunit. The two lysines substituted with glutamate (see text)
are labeled with bold yellow letters.
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