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Quinolinate phosphoribosyltransferase (QPRT), purified from hog liver, has been crystallized using PEG 8000 as the precipitant. The crystals form long hexagonal rods in the space group P6322 with cell dimensions a = b = 121.7, c = 94.5 A. Based on the unit-cell dimensions and the calculated molecular mass of 33 500 Da, the Matthews coefficient suggests one molecule per asymmetric unit (Vm = 3.45 A3 Da-1; 64% solvent). Three native data sets were collected to a resolution of 2.5 A and merged to provide a set that is 94.7% complete, with an Rsym value of 9.6%.

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