Abstract
Beta amylase from sweet potato has been crystallized in a form suitable for high resolution X-ray diffraction analysis from a mixture of polyethylene glycol 400 and ammonium sulfate at room temperature. The crystals are rectangular prisms and occasionally reach a size of 1 mm on an edge. The space group of the crystals is I422 with cell dimensions of a = b = 196·4 Å and c = 72·2 Å. There are four tetramers of about M r = 210,000 in the unit cell centered at 222 symmetry points. The asymmetric unit is a single beta amylase subunit of about M r = 52,000. The tetrameric molecule must have exact 222 molecular symmetry relating its subunits.
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