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Phosphopantetheine adenylyltransferase (PPAT, E.C. 2.7.7.3) catalyzes the penultimate step in coenzyme A (CoA) biosynthesis, transferring an adenylyl group from ATP to 4′-phosphopantetheine, and forming dephospho-CoA. Cubic crystals of native PPAT from Escherichia coli as well as PPAT in complex with its substrates were obtained. The crystals belong to space group I23 or I213 with unit-cell dimension a = 135.5 Å. The crystals diffract to better than 1.8 Å resolution on a Cu Kα rotating-anode generator. The asymmetric unit is likely to contain two molecules, corresponding to a packing density of 2.9 Å3 Da−1.

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