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Figure 2<br />

<strong>Structure</strong>-<strong>based</strong> drug design strategy.<br />

Page 153<br />

A tight fit is necessary for potency and specificity. A drug that binds to its target and inactivates it for a<br />

long time can be administered in lower doses than one that rapidly separates from its target. A substance<br />

designed to mesh perfectly with a particular binding site of one target is unlikely to interact well with<br />

any other molecule, minimizing unwanted interactions and side effects.<br />

Having chosen PNP as the target, we followed a systematic strategy for designing inhibitory<br />

compounds. Figure 2 outlines the overall strategy of this approach. To serve as a drug, an inhibitor has<br />

to readily cross cell membranes to the interior of cells, where PNP is located.<br />

http://legacy.netlibrary.com/nlreader/nlReader.dll?bookid=12640&filename=Page_153.html (1 of 2) [4/5/2004 5:01:14 PM]

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