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Elucidating binding modes of zuonin A enantiomers to JNK1 via in silico methods

Daniel W Dykstra1, Kevin N Dalby, Pengyu Ren

  • 1Department of Biomedical Engineering, University of Texas at Austin, TX 78712, USA; Department of Biochemistry, University of Texas at Austin, TX 78712, USA.

Journal of Molecular Graphics & Modelling
|September 5, 2013
PubMed

Insights

Enantiomers of zuonin A, (-)-zuonin A and (+)-zuonin A, are non-ATP competitive inhibitors of c-Jun N-terminal kinase (JNK). Molecular simulations reveal distinct binding modes, explaining (-)-zuonin A

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Aberrant c-Jun N-terminal kinase (JNK) signaling is implicated in diseases like cancer and neurological disorders.
  • Zuonin A enantiomers, (-)-zuonin A and (+)-zuonin A, are non-ATP competitive inhibitors targeting JNK.
  • These compounds disrupt JNK protein-protein interactions at the D-recruitment site.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying the differential inhibitory activities of (-)-zuonin A and (+)-zuonin A against JNK.
  • To elucidate the binding modes of these enantiomers using computational simulations.
  • To provide insights into the development of novel JNK inhibitors.

Main Methods:

  • Molecular docking simulations to predict binding poses.
  • Molecular dynamics simulations to analyze dynamic interactions.
  • Analysis of binding site interactions and conformational changes.

Main Results:

  • Both (-)-zuonin A and (+)-zuonin A bind to JNK isoforms with similar affinity.
  • (-)-zuonin A exhibits significantly higher inhibition of JNK activity (80%) compared to (+)-zuonin A (15%).
  • Molecular simulations suggest (-)-zuonin A engages JNK via an induced fit mechanism near the φA-X-φB site, while (+)-zuonin A binding is less dynamic.

Conclusions:

  • The distinct binding modes identified through computational simulations may explain the differing inhibitory efficacies of (-)-zuonin A and (+)-zuonin A.
  • (-)-zuonin A's induced fit mechanism suggests a more stable and effective interaction with JNK.
  • Further experimental validation is required to confirm these binding interpretations and their implications for JNK inhibition.
Keywords:
DockingJNKKinaseMAPKMolecular dynamicsNon-ATP competitive inhibitor

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