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Figure 2.
FIG. 2. Ribbon representation of the three-dimensional
structure of CtCBM11. a, Stereo representation of the overall
structure of CtCBM11. The CtCBM11 structure consists of a
distorted  -jelly roll fold
composed of two six-stranded antiparallel -sheets, which form a
convex side ( -strands drawn in dark
blue) and a concave side ( -strands drawn in light
blue). The two calcium ions are indicated as green spheres. The
concave side of CtCBM11 forms a cleft. Residues inside the
putative binding cleft are shown as ball-and-stick models.
Tyrosine residues are represented in red, arginines are in
yellow, histidines are in pink, and aspartates are in orange.
The picture was drawn with the program MOLMOL (42). b, stereo
view of the CtCBM11 cleft, in the same orientation as in a,
occupied by the C terminus residues of a symmetry-related
molecule. The residues are labeled in red and represented in
ball-and-stick. The 2mF[o] - DF[c] electron density map around
the molecule is shown in dark blue and contoured at 1.1  .
Residues inside the cleft (color code) are shown as
ball-and-stick models and labeled blue. The calcium-binding
site, Ca1, is represented as a green sphere. The picture was
produced with the program TURBO-FRODO (27).
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