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Figure3<br />

(a) Stereo diagram of the secondary structural elements of IL-1β. Produced <strong>by</strong> Molscript [106].<br />

(b) Stereo plot of all the atoms of IL-1β viewed parallel to the axis of the barrel.<br />

Page 404<br />

42,44], and once <strong>by</strong> NMR [43]. The four crystal structures, each to 2.0 Å, were all solved in the same<br />

space group, P4 3, each structure being in relatively good agreement with the others [53]. As pointed out<br />

previously, the molecule adopts a β-trefoil fold with about 65% of the molecule in beta sheet and 35% in<br />

random coil/turn (Figure 3a). The IL-1β molecule resembles a conical barrel with a shallow open face<br />

on one end and a closed face on the other. The length of the long tubular core of the molecule is about<br />

23 Å. Twelve antiparallel β<br />

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