Ramzi Alsallaq, Huan-Xiang Zhou  Structure 

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Prediction of Protein-Protein Association Rates from a Transition-State Theory  Ramzi Alsallaq, Huan-Xiang Zhou  Structure  Volume 15, Issue 2, Pages 215-224 (February 2007) DOI: 10.1016/j.str.2007.01.005 Copyright © 2007 Elsevier Ltd Terms and Conditions

Figure 1 Illustration of the Energy Landscape for Protein-Protein Association (A) The bound state is located in a deep well of the interaction energy. The transition state, indicated by a green ring, marks the end of the sharp increase in interaction energy and the start of the increase in translational and rotation freedom. (B) The six degrees of relative translational and rotational freedom between two associating proteins. One protein, shown in blue, was fixed in space; the other, shown in red, was allowed to translate and rotate. The three translational degrees of freedom were represented by the displacement vector, r, between the centers of the binding sites on the two proteins. Of the three rotational degrees of freedom, two were a unit vector, e, attached to the moving protein, and the remaining one was the rotational angle, χ, around the unit vector. In the X-ray structure of the bound complex, the relative separation, r, is 0, and the rotation angle, χ, is 0°. (C) Transition of the standard deviation of χ, σχ, from the bound state (with high contact levels) to the unbound state (with low contact levels). The start of the sharp increase in σχ marks the transition state, which was uniquely determined by a maximum of Ξ. Actual data for the IL4-IL4BP complex are shown for illustration (with Nc‡=16). Structure 2007 15, 215-224DOI: (10.1016/j.str.2007.01.005) Copyright © 2007 Elsevier Ltd Terms and Conditions

Figure 2 Electrostatic Potential Surfaces of the Subunits in the Four Protein Complexes Studied (A) Bn-Bs. (B) E9-Im9. (C) IL4-IL4BP. (D) Fas-AChE. Positive and negative potentials are shown in blue and red, respectively. Mutated residues are labeled. Potential surfaces were generated by the APBS program (Baker et al., 2001) and were displayed by PyMOL (http://www.pymol.org). Structure 2007 15, 215-224DOI: (10.1016/j.str.2007.01.005) Copyright © 2007 Elsevier Ltd Terms and Conditions

Figure 3 Dependences of ka on Ionic Strength for Wild-Type Complexes Structure 2007 15, 215-224DOI: (10.1016/j.str.2007.01.005) Copyright © 2007 Elsevier Ltd Terms and Conditions

Figure 4 Comparison of ka between Prediction and Experiment for 23 Mutants Mutants were studied over different ranges of ionic strength, resulting in a total of 81 data points. A diagonal line is drawn to indicate ideal agreement. Structure 2007 15, 215-224DOI: (10.1016/j.str.2007.01.005) Copyright © 2007 Elsevier Ltd Terms and Conditions

Figure 5 Insensitivity of the Predicted Rate to the Choice of the Transition-State Contact Level Dependences of ka0, exp(−ΔGel‡/kBT), and ka=ka0exp(−ΔGel‡/kBT) on Nc‡ for the Bn-Bs complex. Values are scaled by those at Nc‡=14. Structure 2007 15, 215-224DOI: (10.1016/j.str.2007.01.005) Copyright © 2007 Elsevier Ltd Terms and Conditions