Abstract
Phospholipase D (E.C. 3.1.4.4) from Streptomyces antibioticus has been crystallized in six crystal forms using the hanging-drop vapour-diffusion method. The type III and V crystals belong to monoclinic and hexagonal systems, respectively. All of the other crystal forms, types I, II, IV and VI, belong to orthorhombic space group P212121. Of these four types, the type VI crystals are suitable for X-ray structure determination. Crystal data for type VI crystals are: a = 50.1, b = 98.7, c = 107.6 A, V = 532100 A3, Z = 4 and Vm = 2.47 A3 Da-1. Type VI crystals diffract to at least 2.3 A resolution. A total of 11295 independent reflections to 3 A resolution have been collected from a type VI crystal using a conventional X-ray source, and its structural analysis is currently being conducted using isomorphous replacement methods.
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