title: Crystallization of barley malt alpha-amylases and preliminary x-ray diffraction studies of the high pI isozyme, alpha-amylase 2.
abstract: alpha-Amylase isozymes 1 and 2 isolated from germinated barley seeds have been crystallized by the hanging- or sitting-drop vapor diffusion technique. Crystals of alpha-amylase 2 suitable for x-ray diffraction analysis were grown at pH 6.7 and 22 degrees C from a solution of 1 mM calcium chloride, 10 mM MES, and 16% saturated ammonium sulfate. The space group is trigonal P3121 (or P3221) with unit cell dimensions a = b = 135.20 A, c = 79.63 A, and probably two molecules per asymmetric unit.
mesh_terms: D003460:Crystallization; D001467:Hordeum / Q000201:enzymology; D006863:Hydrogen-Ion Concentration; D007527:Isoenzymes / Q000302:isolation & purification; D010944:Plants / Q000201:enzymology*; D011487:Protein Conformation; D014961:X-Ray Diffraction; D000516:alpha-Amylases / Q000302:isolation & purification
chemical_list: D007527:Isoenzymes; D000516:alpha-Amylases