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Figure 5<br />

Stereo view AG1343 (nelfinavir) bound to the active site of HIV PR.<br />

Page 21<br />

acids qualifies nelfinavir to be a member of the group of nonpeptidic inhibitors of HIV PR. The unique,<br />

and perhaps crucial hydrogen-bonding interaction of the P2 hydroxyl group with the carboxylate oxygen<br />

of Asp30, combined with the smaller area of hydrophobic contacts in the S1 and S3 specificity subsites<br />

are the principal differences from other clinically active HIV PR inhibitors and may contribute to a<br />

distinct resistance pattern and point to additional utility of nelfinavir in the treatment of AIDS.<br />

<strong>Design</strong> and <strong>Structure</strong> of DMP323<br />

A cyclic urea-containing HIV PR inhibitor, DMP323, was discovered using de novo structure-<strong>based</strong><br />

design principles. Similar to the concept of Erickson and his co-workers from Abbott Laboratories, the<br />

group from DuPont-Merck attempted to take advantage of the two-fold symmetry of HIV PR in<br />

designing compounds that maintained the interaction of the diol with the catalytic aspartic acids 25/25'<br />

and at the same time were able to functionally displace the ubiquitous flap water molecule Wat301.<br />

They hypothesized that incorporation of the binding features of this structural water molecule into an<br />

inhibitor would be beneficial because of the entropic gain due to its displacement and because the<br />

conversion of a flexible linear inhibitor into a rigid, cyclic structure with restricted conformation should<br />

provide an additional, positive entropic effect. In the initial design, a cyclohexanone with the ketone<br />

oxygen as the structural<br />

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