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  • Title: Preliminary crystallographic analysis of sweet potato beta amylase.
    Author: Cudney R, McPherson A.
    Journal: J Mol Biol; 1993 Jan 05; 229(1):253-4. PubMed ID: 8421309.
    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 A and c = 72.2 A. 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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