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

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Document<br />

Figure 10<br />

Schematic diagram showing the IL-1-<strong>based</strong> therapeutic molecules.<br />

Page 414<br />

tions provided enough information related to the structure-activity relationship. The mutant IL-1Ra<br />

K145D was mutated further to V18S, T108K, C116F, C122S, C122A, Y147T, Y147G, H54P, and a<br />

H54I. Of these, K145D + T108K showed a 2-fold decrease in IL-1RI binding and a 3-fold decrease in<br />

bioactivity compared to the IL-1Ra K145D analog. The K145D + C116F combination resulted in the<br />

complete loss of bioactivity, whereas full receptor-binding activity was maintained. The observation that<br />

receptor-binding activity is preserved indicates that the binding site is not altered that much. Structural<br />

alignment<br />

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