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Moving Beyond Active-Site Detection: MixMD Applied to Allosteric Systems.

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Mixed-solvent molecular dynamics (MixMD) identifies protein binding hotspots, including competitive and allosteric sites. This flexible technique accurately maps ligand-binding sites using multiple probe types for robust drug discovery.

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Area of Science:

  • Computational chemistry
  • Structural biology
  • Drug discovery

Background:

  • Mixed-solvent molecular dynamics (MixMD) is a technique for mapping protein binding sites using molecular dynamics simulations in binary solvent mixtures.
  • Previous studies confirmed MixMD's efficacy in identifying binding sites for small organic compounds.

Purpose of the Study:

  • To demonstrate that MixMD can identify both competitive and allosteric binding sites on proteins.
  • To establish requirements for identifying ligand-binding hotspots: high signal-to-noise ratio and mapping by multiple probe types.

Main Methods:

  • Utilized MixMD with full protein flexibility, allowing competition between solvent probes and water.
  • Employed acetonitrile, isopropanol, pyrimidine, and charged probes to capture diverse interactions.
  • Applied a total of 5 μs of MixMD across multiple protein targets, including kinases and receptors, some lacking pre-organized allosteric ligands.

Main Results:

  • MixMD successfully identified known competitive and allosteric sites as top-ranked hotspots.
  • Lower-ranked sites corresponded to other biologically relevant regions, interfaces, or crystal-packing sites.
  • Demonstrated MixMD's ability to map allosteric sites missed by FTMap when protein flexibility was considered.

Conclusions:

  • MixMD is a robust and versatile technique for mapping diverse ligand-binding sites, including allosteric ones.
  • The inclusion of protein flexibility is crucial for accurately identifying allosteric binding pockets.
  • MixMD offers significant advantages for drug discovery by revealing critical binding site information.