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The gene product of open reading frame Rv1653 from Mycobacterium tuberculosis is annotated as encoding a probable ornithine acetyltransferase (OATase; EC 2.3.1.35), an enzyme that catalyzes two steps in the argininebiosynthesis pathway. It transfers an acetyl group from N-acetylornithine to l-glutamate to produce N-acetylglutamate and l-ornithine. Rv1653 was crystallized using the sitting-drop vapour-diffusion method. The native crystals diffracted to a resolution of 1.7 Å and belonged to space group P2 1 2 1 2 1 , with unit-cell parameters a = 60.1, b = 99.7, c = 155.3 Å . The preliminary X-ray study showed the presence of a dimer in the asymmetric unit of the crystals, which had a Matthews coefficient V M of 2.8 Å 3 Da À1 .

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