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Figure 3<br />

(a) Stereo view of the thrombin molecule in its complex with NAPAP. The side chains of<br />

thrombin involved in the binding of NAPAP and the disulfide bridges are shown in<br />

stick-and-ball representation with black sticks. NAPAP is shown in stick-and-ball<br />

representation with white sticks. (b) Zoom image of the active site region. Figures made<br />

with the program MOLSCRIPT [42].<br />

Page 548<br />

bonds. These are 214CO, 216NH, 216CO, and 219NH in S1; 193NH and 195NH in the oxyanion hole;<br />

41CO in S1'; 40CO in S2'; and 147NH and 148NH on the autolysis loop, whose exposure is dependent<br />

on crystallization conditions and inhibitor type.<br />

Two main conclusions can be drawn from the analysis of the minimized positions of the charged<br />

functional groups. First, the minima with the lowest binding free energy have optimal hydrogen bonds<br />

with the Asp189 side chain in the S1 pocket. Representative examples are the lowest energy minimum<br />

of benzamidine (Figure 5) and the lowest energy minima of methylguanidinium and methylammonium<br />

(Figure 4 of Reference 28). Since the Asp189 side chain<br />

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