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

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Page 513<br />

broad spectrum activity (Table 8) [56,90]. While certain less-flexible compounds may have increased<br />

potency for a particular serotype of HRV, these compounds have lower potency versus other serotypes.<br />

It is not known if the effect of flexibility is an equilibrium or kinetic effect. The flexibility might allow<br />

the compounds to expand or contract to fill available space in the VP1 hydrophobic pocket.<br />

Alternatively, the flexibility may allow the compounds to achieve a conformation required to enter or<br />

leave the pocket, but this conformation would not be seen in the crystallographic experiment. If this is<br />

true, modeling of the equilibrium structure of compounds in the pocket will not be accurate predictors of<br />

compound potency.<br />

<strong>Structure</strong>—Activity Relationship <strong>Summary</strong><br />

The combination of classical structure—activity relationships combine with the structures of several<br />

compounds in a number of HRV serotypes have led to a paradigm for designing potent compounds. The<br />

effects of pocket shape, requirements for hydrophobicity in the toe of the pocket, as well as the potential<br />

for hydrogen bonding in the heel region appear to be strong determinants of antiviral potency. The<br />

requirement for a broad spectrum has so far limited a more detailed paradigm, such as one that might<br />

exist for designing inhibitors to a specific serine protease. In spite of this vagueness of antirhinoviral<br />

structure—activity relationships, they have been useful in guiding new compound synthe-<br />

http://legacy.netlibrary.com/nlreader/nlReader.dll?bookid=12640&filename=Page_513.html [4/9/2004 12:44:57 AM]

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