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Peptide deformylase (PDF) is responsible for cleaving the formyl group at the N-terminus of nascent polypeptide chains in eubacteria and is essential to bacterial cell viability. A recombinant PDF of the thermophilic bacterium Thermus thermophilus HB8 has been crystallized by the hanging-drop vapour-diffusion method using PEG 4000 as a precipitant. The crystals belonged to the tetragonal space group P41 or P43, with unit-cell parameters a = b = 62.58, c = 105.27 Å, and are most likely to contain two molecules in an asymmetric unit, giving a crystal volume per protein weight (VM) of 2.3 Å3 Da-1 and a solvent content of 46.7%.

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