Symmetry, molecular weight and crystallographic data for sweet potato β-amylase

Sweet potato β-amylase has been crystallized in the tetragonal space group P4122 (or enantiomorph) with unit cell dimensions a = b = 210.7 Å, c = 157.0 Å. A new method has been developed by which accurate molecular weight values can be obtained from protein crystals grown from concentrated salt solutions. The method also gives the hydration of the protein in the crystal. Using this new technique the molecular weight of β-amylase was found to...