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ITC analysis of RA binding to VmFbpA at 298 K. (a) Binding between 10 μM apo VmFbpA and 500 μM RA. (b) Binding between 10 μM Fe3+-VmFbpA and 500 μM RA. (c) Binding between 10 μM apo VmFbpA and 100 μM Fe3+. (d) Thermodynamic parameters for the binding of RA to apo VmFbpA calculated according to the data in (a). The free energy of binding (ΔG, light yellow bar) is the sum of the enthalpic (ΔH, light green bar) and entropic (−TΔS, light blue bar) terms.
