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Page 176<br />

0.43 Å) as the catalytic-domain structure of HFC. This demonstrates that the absence or presence of the<br />

hemopexin domain does not affect the overall structure of the catalytic domain.<br />

The sequence homology of the catalytic domains of the collagenases is 62%. This can be extended to the<br />

other members of the MMP family as seen in Figure 3. An understanding of the structural features of the<br />

target enzyme is essential for structure-<strong>based</strong> drug design. In this example we will be looking at<br />

inhibiting MMPs <strong>by</strong> binding to the active site. The numbering system used throughout this chapter will<br />

be in regard to the HFC sequence used in 1hfc.pdb.<br />

III. Surface Features<br />

The surface features of matrilysin, fibroblast collagenase, and neutrophil collagenase are all similar<br />

(Figure 4). The active-site groove can be plainly seen on the surface: two main pockets punctuated <strong>by</strong><br />

the active-site zinc. Modeling<br />

Figure 4<br />

The accessible surfaces of HFC (a), HNC (b), and matrilysin<br />

(c) are shown with a bound P'-side hydroxamate inhibitor.<br />

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