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Related Experiment Videos

Unique sequences in the guinea pig glucocorticoid receptor induce constitutive transactivation and decrease steroid

M C Keightley1, P J Fuller

  • 1Prince Henry's Institute of Medical Research Clayton, Australia.

Molecular Endocrinology (Baltimore, Md.)
|April 1, 1994
PubMed
Summary
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The guinea pig glucocorticoid receptor (GR) LBD confers cortisol resistance and high constitutive activity, as demonstrated by domain-swap experiments. This finding offers insights into steroid receptor function and drug development.

Area of Science:

  • Molecular Biology
  • Endocrinology
  • Structural Biology

Background:

  • Characterizing glucocorticoid receptor (GR) structural determinants for cortisol binding is challenging due to ligand binding domain (LBD) modification sensitivity.
  • Guinea pigs exhibit cortisol resistance, linked to a GR with reduced dexamethasone affinity.

Purpose of the Study:

  • To investigate the role of the guinea pig GR LBD in conferring cortisol resistance and constitutive activity.
  • To identify specific amino acid substitutions in the guinea pig GR LBD responsible for altered steroid binding and activity.

Main Methods:

  • Cloning and sequencing of the guinea pig GR.
  • Domain-swap experiments exchanging human and guinea pig GR LBDs in expression vectors.
  • Dexamethasone response curve analysis and investigation of constitutive activity modulation.

Related Experiment Videos

Main Results:

  • The guinea pig GR LBD successfully conferred cortisol resistance and constitutive activity in vitro.
  • Constitutive activity was not repressed by RU486 but enhanced by 8-bromo-cAMP.
  • A key cysteine-to-tryptophan substitution in the guinea pig GR LBD was identified as significant.

Conclusions:

  • The guinea pig GR LBD is sufficient to confer cortisol resistance and constitutive activity.
  • Specific amino acid changes, including Cys to Trp, in the guinea pig GR LBD are critical for its unique functional properties.
  • This study provides a model for understanding GR structural determinants and potential therapeutic targeting.