Crystallization and preliminary X-ray crystallographic analysis of the XoGroEL chaperonin from Xanthomonas oryzae pv. oryzae

Along with the co-chaperonin GroES, the chaperonin GroEL plays an essential role in enhancing protein folding or refolding and in protecting proteins against misfolding and aggregation in the cellular environment. The XoGroEL gene (XOO_4288) from Xanthomonas oryzae pv. oryzae was cloned and the protein was expressed, purified and crystallized. The purified XoGroEL protein was crystallized using the hanging-drop vapour-diffusion method and a crystal diffracted to a resolution of 3.4 Å. The crystal belonged to the orthorhombic space group P2₁2₁2₁ with 14 monomers in the asymmetric unit, with a corresponding V_M of 2.7 Å³ Da^-1 and a solvent content of 54.5%.