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Figure 2.
Figure 2: Model of pOC engaging an HA crystal based on a Ca^2+
ion lattice match. Only the best search solution is shown
(see Supplementary Information for a comparison of the four best
solutions). a, Alignment of pOC-bound (purple) and HA (green)
Ca^2+ ions. b, c, Orientation of pOC-bound Ca^2+ ions in a
sphere of HA -Ca lattice (b) and on the HA surface (c). In b,
the parallelogram indicates a unit cell; the box approximates
the boundary of the slab shown in c and d. d, Docking of pOC
(orange backbone with grey semitransparent surface) on HA. e,
Detailed view of d showing the Ca -O coordination network at the
pOC -HA interface. Yellow broken lines denote ionic bonds.
Isolated red spheres and the tetrahedral clusters of magenta and
red spheres represent OH- and PO[4]^3- ions, respectively.
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