Overexpression, purification and crystallization of bacteriocin LlpA from Pseudomonas sp. BW11M1

LlpA is a bacteriocin produced by Pseudomonas sp. BW11M1 that shows remarkable similarity to a family of mannose-binding plant lectins. A His-tagged version of LlpA was recombinantly produced in Escherichia coli and purified to homogeneity. Single crystals were grown by vapour diffusion and belong to space group P2(1)2(1)2, with unit-cell parameters a = 150.5, b = 154.5, c = 34.2 A. The crystals diffract to at least 2.2 A using synchrotron radiation.