X-ray synchrotron radiation scattering data from solutions of dark-state PtAUREO1a bZIP-LOV module in 10mM Tris HCl pH 8 300mM NaCl buffer was collected on the BM29 camera on the storage ring ESRF (Grenoble, France) using a 2D Photon counting Pilatus 1M-W pixel detector (s = 4π sin θ/λ, where 2θ is the scattering angle). Ten successive 20 second frames were collected. The data were normalized to the intensity of the transmitted beam and radially averaged; the scattering of the solvent-blank was subtracted. Solution scattering data of bZIP-LOV module in the dark-state was performed at 0.625-2.5 mg/mL concentration at 4 degrees centigrade. The SAXS data derived from the concentration series were merged for analysis using the ATSAS package. For further sequence information refer to the Joint Genome Institute (JGI) entry JGI-49116.