This PDF file includes:

• Materials and Methods
• Fig. S1. Stereo view of the electron density of the N-terminal region of holo-FNR (starting at His¹⁹), shown as a black mesh contoured at 1σ.
• Fig. S2. Comparison of the α-C helical dimerization interfaces of FNR and other selected CRP-family members, using deposited structures at the Protein Data Bank.
• Fig. S3. Stereo image viewed down the dimer twofold axis.
• Fig. S4. Stereo image of the electron density near the center of the dimer interface.
• Fig. S5. Stereo image of the superposition of FNR (purple) to FixK₂ (green) showing the similar position and orientation of the DNA binding α-F helices at the bottom of the figure.
• Table S1. X-ray data and refinement statistics.
• References (24–33)

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