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Understanding the thyrotropin receptor function-structure relationship

J Sanders1, Y Oda, S A Roberts

  • 1FIRS Laboratories, RSR Ltd, Llanishen, Cardiff, UK.

Bailliere'S Clinical Endocrinology and Metabolism
|April 9, 1998
PubMed

Insights

The thyrotropin receptor (TSHR) is crucial for thyroid function and is a target in autoimmune diseases. Understanding TSHR structure and function, particularly binding sites, is key to advancing thyroid disorder treatments.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Immunology

Background:

  • The thyrotropin receptor (TSHR) is central to thyroid hormone regulation and a significant autoantigen in thyroid diseases.
  • Recent molecular cloning of the TSHR has provided new avenues for understanding its physiological and pathophysiological roles.

Purpose of the Study:

  • To review the impact of TSHR molecular cloning on understanding its physiology and pathophysiology.
  • To discuss the role of post-translational modifications and subunit processing in TSHR function.
  • To highlight the challenges and future directions in characterizing TSHR binding sites for TSH and autoantibodies.

Main Methods:

  • Analysis of recombinant TSHR proteins expressed in prokaryotic and eukaryotic systems.
  • Studies on TSHR glycosylation patterns and their effect on TSH and TSHR autoantibody (TRAb) binding.
  • Investigation of TSHR peptide chain processing into subunits.

Main Results:

  • Post-translational processing, particularly glycosylation, is essential for forming active TSHR.
  • A mature TSHR form with complex-type sugar residues is primarily involved in TSH and TRAb binding.
  • Recombinant TSHR confirmed the native TSHR's processing into two subunits, but binding sites remain poorly characterized.

Conclusions:

  • Understanding TSHR glycosylation and subunit processing is vital for comprehending thyroid function and autoimmune thyroid diseases.
  • Further research, including crystallographic analysis of TSHR-ligand complexes, is needed to elucidate the hormone and autoantibody binding sites.
  • Advances in producing pure TSHR and monoclonal TRAbs will facilitate a deeper insight into TSHR structure-function relationships.

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