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netLibrary - eBook Summary Structure-based Drug Design by ...

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Figure 5<br />

(a) A cut away view of the S1' pocket of HFC showing the termination of<br />

the pocket <strong>by</strong> Arg214. Matrilysin also has a truncated pocket. (b) A cut away<br />

view of the S1' pocket of HNC showing the clear path through to the other<br />

side of the enzyme. The gelatinases are also likely to have large extended S1'<br />

pockets.<br />

123 Å 3. The pocket of the neutrophil collagenase that travels through the enzyme has a volume of 305<br />

Å 3. Figure 5 demonstrates the differences in the relative sizes of the S1' pockets of HFC and HNC.<br />

Stromelysin has a pocket that should be of similar size as that of neutrophil collagenase [21]. The<br />

gelatinases and collagenase-3, <strong>based</strong> on sequence alignment, should also posses long tunnel-like S1'<br />

pockets.<br />

Page 180<br />

The residues that line the S1' pocket are mostly hydrophobic residues (see Figure 3) and show a<br />

remarkable overall similarity. The specificity of a number of inhibitors of MMPs can be linked to<br />

differences in the S1' pockets. The S1' pocket of HFC is terminated <strong>by</strong> arginine 214, while matrilysin<br />

has a tyrosine residue that accomplishes the same thing. The remainder of the aligned MMPs have<br />

leucine residues at that position. In addition the conformation of the leucine residue is swung back,<br />

forming the tunnel. There are three additional residues that are significant in their differences within the<br />

S1' pocket: residues 239 and a two-residue insert, relative to HFC, after residue 242. These residues<br />

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