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Volume 84, Issue 4, Pages (April 2003)

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1 Volume 84, Issue 4, Pages 2273-2281 (April 2003)
Ligand-Induced Conformational Changes: Improved Predictions of Ligand Binding Conformations and Affinities  Thomas M. Frimurer, Günther H. Peters, Lars F. Iversen, Henrik S. Andersen, Niels Peter H. Møller, Ole H. Olsen  Biophysical Journal  Volume 84, Issue 4, Pages (April 2003) DOI: /S (03) Copyright © 2003 The Biophysical Society Terms and Conditions

2 Figure 1 Chemical structures of inhibitors used in the docking experiments. Biophysical Journal  , DOI: ( /S (03) ) Copyright © 2003 The Biophysical Society Terms and Conditions

3 Figure 2 Superposition of the 96 models used for docking.
Biophysical Journal  , DOI: ( /S (03) ) Copyright © 2003 The Biophysical Society Terms and Conditions

4 Figure 3 Calculated titration curves. Open squares, circles, and triangles represent the calculated titration curves for Asp48, Lys120, and Asp181, respectively, in absence of the inhibitor. The titration curves in presence of the inhibitor are represented with solid symbols. Biophysical Journal  , DOI: ( /S (03) ) Copyright © 2003 The Biophysical Society Terms and Conditions

5 Figure 4 FlexX docking results obtained against the reference structure. (A) The 15 lowest predicted free energies of binding [kJ/mol] of inhibitor 1 versus the RMS difference (Å). The difference is calculated between the docked and the experimentally observed ligand binding conformation. B and C show the results obtained for the inhibitors 2 and 3, respectively. Biophysical Journal  , DOI: ( /S (03) ) Copyright © 2003 The Biophysical Society Terms and Conditions

6 Figure 5 Results obtained from FlexX docking experiments against the 96 models of the PTP1B binding site. (A) Lowest free energy of binding [kJ/mol] of inhibitor 1 to each of the 96 protein models as function of the RMS difference between the docked and the experimentally observed binding mode. B and C show the results obtained for the inhibitors 2 and 3, respectively. Biophysical Journal  , DOI: ( /S (03) ) Copyright © 2003 The Biophysical Society Terms and Conditions

7 Figure 6 Solutions obtained by docking compounds 1, 2, or 3 to the protein model, which has the best score according to the results in Fig. 5. (A) The 15 best scored complexes [kJ/mol] for compound 1 versus the RMS difference (Å). B and C show the results obtained for the inhibitors 2 and 3, respectively. Biophysical Journal  , DOI: ( /S (03) ) Copyright © 2003 The Biophysical Society Terms and Conditions

8 Figure 7 Comparison of x-ray crystallographic structures and docked modes obtained for the best PTP1B models. A–C show the structures of inhibitors 1, 2, and 3, respectively in complex with PTP1B. Side-chain conformations of the best PTP1B models and the corresponding docked inhibitor are shown in gray. The crystal structures in complex with the compounds are shown in green, and the reference side-chain conformations are shown in red. Biophysical Journal  , DOI: ( /S (03) ) Copyright © 2003 The Biophysical Society Terms and Conditions

9 Figure 8 Comparison of the potential energies of the various PTP1B protein models as a function of the RMS differences to the x-ray structures in complex with the inhibitors. A, B, and C are for the inhibitors 1, 2, and 3, respectively. The open circles indicate the five models, which were predicted to have the best (i.e., lowest) binding energy. Biophysical Journal  , DOI: ( /S (03) ) Copyright © 2003 The Biophysical Society Terms and Conditions


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