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Recombinant erabutoxin a (Ea(r)) has been crystallized by vapour diffusion in hanging drops. The crystals belong to space group P2(1)2(1)2(1) with cell dimensions a = 55.8 A, b = 53.4 A, c = 40.8 A. Diffraction data have been recorded on a FAST detector up to 2.0 A. The atomic crystal structure of Ea(r) has been determined by initial refinement of the structure of the isotoxin erabutoxin b (Eb) the crystals of which were grown under identical conditions. The R-factor was 23% at 2.0 A resolution. The secondary and tertiary structures of Ea(r) are shown to be identical with that of wild-type Eb, within the experimental error.
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