Expression, purification, crystallization and preliminary crystallographic analysis of a putative Clostridium...

Cwp19 is a putatively surface-located protein from Clostridium difficile. A recombinant N-terminal protein (residues 27-401) lacking the signal peptide and the C-terminal cell-wall-binding repeats (PFam04122) was crystallized using the sitting-drop vapour-diffusion method and diffracted to 2 Å resolution. The crystal appeared to belong to the primitive monoclinic space group P2(1), with unit-cell parameters a=109.1, b=61.2, c=109.2 Å, β=111.85°, and is estimated to contain two molecules of Cwp19 per asymmetric unit.