EpsH is a minor pseudopilin protein of the Vibrio cholerae type II secretion system. A truncated form of EpsH with a C-terminal noncleavable His tag was constructed and expressed in Escherichia coli, purified and crystallized by sitting-drop vapor diffusion. A complete data set was collected to 1.71 Å resolution. The crystals belonged to space group P2 1 2 1 2 1 , with unit-cell parameters a = 53.39, b = 71.11, c = 84.64 Å . There were two protein molecules in the asymmetric unit, which gave a Matthews coefficient V M of 2.1 Å 3 Da À1 , corresponding to 41.5% solvent content.
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