Synchrotron SAXS data from solutions of the N-terminal soluble domain of cell division protein FtsQ in 20 mM phosphate buffer, 25 mM NaCl, pH 6.5 were collected on the 5-ID-D DND-CAT beam line at the Advanced Photon Source (APS), Argonne National Laboratory (Lemont, IL, USA) using a Rayonix LX170HS detector at a sample-detector distance of 0.2 m and at a wavelength of λ = 0.12398 nm (I(s) vs s, where s = 4πsinθ/λ, and 2θ is the scattering angle). Solute concentrations ranging between 0.8 and 1.5 mg/ml were measured at 21°C. Eight successive 1.150 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. The low angle data collected at lower concentration were merged with the highest concentration high angle data to yield the final composite scattering curve.
s, nm-1
