Fig. 1.

Small-angle X-ray scattering.

A. A photograph of a SAXS setup and an illustration of an X-ray scattering image. B. A plot showing the experimental SAXS curve for the E. coli ArnA protein collected at Argonne National Laboratory using the Advanced Photon Source beamline 18-ID (black) and the theoretical SAXS curve derived from the X-ray crystal structure of the E. coli ArnA protein (PDB ID: 1Z7E) (orange) [27]. C. The Guinier plot is shown for the E. coli ArnA protein. The R_g of the protein was 52 Å. D. The P(r) plot for the E. coli ArnA protein. The D_max of the protein was 150 Å. E. The Kratky plot is shown for the E. coli ArnA protein. F. The X-ray crystal structure of the E. coli ArnA protein (PDB ID: 1Z7E) [27] fit within the envelope obtained from ab initio shape predictions using DAMMIF [30]. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)