Crystallographic characterization of pertactin, a membrane-associated protein from Bordetella pertussis

Pertactin, a membrane-associated protein of Bordetella pertussis, has been crystallized in the presence of 28% ammonium sulphate. The space group is P6(3)22 with cell dimensions a = b = 178.2 A and c = 106.8 A. The crystals diffract to 3.3 A using a rotating anode source and are suitable for an X-ray structure determination. Assuming one molecule in the asymmetric unit, 70% of the cell is occupied by solvent.