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Glucocorticoid receptor (GR) gene mutations cause resistance by disrupting the ligand-binding pocket. Deacylcortivazol effectively restores transcriptional activity in these resistant GR mutants.

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Area of Science:

  • Molecular biology
  • Genetics
  • Biochemistry

Background:

  • Glucocorticoid receptor (GR) gene mutations can lead to generalized glucocorticoid resistance syndrome.
  • Missense mutations often affect the ligand-binding domain, impairing ligand binding and activation function-2 (AF-2) formation.
  • AF-2 is crucial for binding coactivators containing LXXLL motifs.

Purpose of the Study:

  • To investigate the structural defects in the ligand-binding domain of pathological GR mutants using molecular dynamics simulations.
  • To understand the molecular mechanisms underlying glucocorticoid resistance caused by GR mutations.

Main Methods:

  • Molecular dynamics simulations were performed on the ligand-binding domain of pathological GR mutants.
  • Calculated parameters included interaction energy for dexamethasone and LXXLL peptides.
  • Structural defects and their impact on ligand binding and coactivator interaction were analyzed.

Main Results:

  • Destruction of the ligand-binding pocket (LBP) is a primary characteristic of these mutants.
  • LBP defects result from loss/reduction of electrostatic interactions involving R611 and T739, leading to conformational mismatch.
  • Deacylcortivazol effectively resolves LBP defects and stimulates transcriptional activity of mutant GRs.
  • Reduced affinity of LXXLL peptides to AF-2 is due to disrupted electrostatic bonds and reduced noncovalent interactions, exposing AF-2 to solvent.

Conclusions:

  • The study reveals specific molecular defects in pathological GR mutants.
  • Understanding these defects provides insights into the function of wild-type GR.
  • Deacylcortivazol shows potential as a therapeutic agent for glucocorticoid resistance.