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IV. Rational <strong>Drug</strong> <strong>Design</strong><br />

Figure 6<br />

The P 3' tyrosine residue of the mouse renin inhibitor complex showing<br />

the unique polyproline loop on the right. Specificity of this and<br />

neighboring subsites in renins must derive partly from this rigid loop<br />

region.<br />

Page 337<br />

The pioneering work of Burton, Szelke, and others in developing peptide-<strong>based</strong> renin inhibitors has been<br />

followed <strong>by</strong> a worldwide commercial effort to elaborate such compounds into therapeutically active<br />

antihypertensives. The twin problems of insufficient oral bioavailability and rapid clearance has<br />

seemingly presented major obstacles to success. In addition, the possible advantages of renin inhibitors<br />

compared with ACE inhibitors remain questionable. Never-theless information from human-renin<br />

crystallographic studies—such as the more recent high resolution analyses [52] and algorithms for<br />

analysing voids in the complexes as potential sites for elaborating the drug molecule (e.g. Figure<br />

7)—may yet provide leads for compounds with suitable therapeutic characteristics.<br />

The detailed analyses of renin-inhibitor complexes reported here confirm the general structural features<br />

thought to contribute to renin's specificity but<br />

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