Synchrotron SAXS data from solutions of antitoxin GraA in complex with the grta operator in 50 mM Tris 250 mM NaCl 2 mM TCEP, pH 8 were collected using size exclusion chromatography SAXS (SEC-SAXS) on the SWING beam line at SOLEIL (Saint-Aubin, France) using a CCD AVIEX PCCD170170 detector at a sample-detector distance of 1.8 m and at a wavelength of λ = 0.10332 nm (l(s) vs s, where s = 4πsinθ/λ, and 2θ is the scattering angle). SEC-SAXS was performed at 10°C using the following parameters: Column: Shodex KW402.5-4F; Flow rate: 0.2 mL/min; Sample injection concentration: approx. 10 mg/mL; Injection volume: 40 μL. 254 successive 1.500 second frames were collected. The SAXS data measured through the SEC elution profile of the sample were normalized to the intensity of the transmitted beam and radially averaged; the scattering of the solvent-blank was subtracted and the individual subtracted data sets were scaled and averaged to generate the scattering profile displayed in this entry.