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Figure 7.
Figure 7. The 2F[o] -F[c] electron density map, contoured
at 1.2s, around the Hg2+-binding region of the Hg-HPK structure,
at 2.3 Å resolution. In the Zn-HPK structure, a zinc atom
is found in the same position, coordinated by the same ligands
(Asp91, His 101, His234) (see bond distances in Table 2). A
probable fourth ligand is a water molecule, which is not
included in the picture. His101 precedes Asp102, which, together
with His57 and Ser195, form the catalytic triad. Asp91 belongs
to the kallikrein loop. The picture was drawn with BOBSCRIPT
[52.] and Raster3D. [51.]
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