A family G xylanase fromAspergillus nigerhas been crystallized using the vapor‐diffusion method. Several crystal forms could be obtained using various sodium salts as precipitants. Three of the crystal forms belong to space groupsP21,P212121andP43and have cell parameters of approximatelya=b= 85.1,c= 113.6 Å and α = β = γ = 90°. These crystal forms can be converted into one another by flash freezing or macroseeding. A fourth crystal form is cubic (space groupP213) with unit‐cell axes ofa=b=c= 112.3 Å. Data sets for three of the four crystal forms have been collected, extending to a maximum resolution of 2.4 Å. The structures of the monoclinic and orthorhombic crystals have been solved by molecular replacement by combining the crystallographic information of the different crystal forms. Refinement of the orthorhombic crystal form is
展开▼
