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Modelling of factor Xa-inhibitor complexes: a computational flexible docking approach.
1Department of Molecular Biology, The Scripps Research Institute, La Jolla, California 92037, USA.
Proteins
|February 18, 1999
Summary
Computational docking reveals how synthetic inhibitors bind to Factor Xa (FXa). Key interactions, including hydrogen bonding with Asp-189 and WAT522, explain inhibitor specificity and affinity.
Area of Science:
- Biochemistry
- Computational Chemistry
- Pharmacology
Background:
- Factor Xa (FXa) is a critical enzyme in the coagulation cascade.
- Understanding FXa inhibitor binding is crucial for developing anticoagulants.
- Existing synthetic inhibitors vary in structure and properties.
Purpose of the Study:
- To elucidate the structural basis of Factor Xa (FXa) specificity.
- To determine the binding modes of various synthetic FXa inhibitors using computational methods.
Main Methods:
- Utilized the AutoDock suite for computational docking simulations.
- Investigated binding modes of inhibitors like ABP, APPA, DABE, and DX-9065a.
- Performed simulations with and without explicit water molecules.
Main Results:
- Identified hydrogen bonding between FXa's Asp-189 residue and inhibitors.
- Observed consistent hydrogen bonding of the active site water molecule WAT522 with all inhibitors.
- Computed binding energies effectively differentiated high-affinity from low-affinity binders.
Conclusions:
- The study provides insights into the structural determinants of FXa inhibitor binding.
- Hydrogen bonding interactions with Asp-189 and WAT522 are key for FXa specificity.
- Computational docking accurately predicts inhibitor affinity and binding modes.