Crystallization and preliminary X-ray analysis of the LOV domain of the blue-light receptor YtvA from Bacillus amyloliquefaciens FZB42.

Light-oxygen-voltage (LOV) proteins play an important role in blue-light-dependent physiological processes in many organisms. The LOV domain of the blue-light receptor YtvA from Bacillus amyloliquefaciens FZB42 has been purified and crystallized at 277 K using the sitting-drop vapour-diffusion method with 2-ethoxyethanol as a precipitant. A data set was collected to 1.60 A resolution from a single crystal at 100 K using synchrotron radiation. The LOV domain of YtvA crystallized in space group C222(1), with unit-cell parameters a = 64.95, b = 83.76, c = 55.81 A. The crystal structure of the LOV domain of YtvA was determined by the molecular-replacement method. The crystal contained one molecule per asymmetric unit, with a Matthews coefficient (V(M)) of 3.04 A(3) Da(-1); the solvent content was estimated to be 59.5%.