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X-ray synchrotron radiation scattering data from solutions of the complex between GM-CSF/IL-2 inhibition factor and ovine Granulocyte-macrophage colony-stimulating factor in 20 mM HEPES 150 mM NaCl were collected on the SWING camera on the storage ring SOLEIL (Saint-Aubin, France) using a CCD AVIEX detector (I(s) vs s, where s = 4π sin θ/λ, where 2θ is the scattering angle). One solute concentration of 10 mg/ml was measured. 10 successive 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 and the different curves were scaled for protein concentration. The purity of the sample was obtained via SEC-SAXS.
Modeling of SAXS data: The crystal structure of the GIF:oGM-CSF complex was used as an input for the Allosmod-FoXS web server to model missing loops, N- and C-termini and N-linked glycosylation. During each Allosmod-FoXS run, data up to a scattering angle of 0.5 Å-1 was used. Fits to the experimental SAXS data were calculated using the FoXS software.
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s, nm-1
