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Figure 2<br />

The accessible surface of HFC with a modeled substrate from human collagen<br />

showing the binding sites.<br />

contains the HExxH motif, the catalytic zinc, and the S1' pocket. Substrates bind in an extended<br />

conformation that approximates an antiparallel strand. The cleft, however, is not large enough to<br />

accommodate a triple helix collagen molecule.<br />

Page 174<br />

A structure for the full-length active porcine synovial collagenase [34] has been determined. The<br />

structure of the catalytic domain of this full-length enzyme is equivalent to the structures of the isolated<br />

catalytic domains of HFC, HNC, and matrilysin. The flexible linker domain between the catalytic and<br />

hemopexin domains is disordered and the orientation of the hemopexin domain in the structure offers no<br />

real clue as to the mode of action for the full-length collagenases. Furthermore, the matrilysin structure<br />

of the full-length active enzyme has almost identical secondary structural features (a Ca overlap of<br />

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