Crystals of bacterially expressed plasminogen activator inhibitor (PAI-1) suitable for X-ray diffraction analysis have been obtained from 8% (w/v) PEG 1500, pH 8.25. The space group is P1, and the lattice constants are a = 82.17 A, b = 47.82 A, c = 62.89 A, alpha = 90.00 degrees, beta = 106.90 degrees, gamma = 106.84 degrees. The diffraction limit is 2.3 A, and the unit cell contains two molecules of PAI-1. The crystals contain latent PAI-1 which can be partly reactivated by exposure to denaturants.
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