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Crystallization and preliminary X-ray diffraction studies of a toxic crystal protein from a subspecies of Bacillus
1Research Institute of Scripps Clinic, La Jolla, California 92037.
The Journal of Biological Chemistry
|August 25, 1988
Abstract:
The toxic crystal protein (Mr 64,000) from a subspecies of the bacterium Bacillus thuringiensis has been solubilized and recrystallized yielding diffraction quality crystals. Crystals are obtained by a change in pH and ionic strength using Na2CO3. They can also be obtained by a change in ionic strength only using NaBr as the precipitant. The space group of both forms is C222(1) with a = 133, b = 116, c = 104 A and one molecule/asymmetric unit. Still photographs show reflections to 3.0-A resolution.