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- W2005417512 abstract "Abstract Hyperfunctional endocrine thyroid and testicular disorders can frequently be traced back to gain-of-function mutations in glycoprotein hormone receptor genes. Deletion mutations in the third intracellular (i3) loop of the TSH receptor have recently been identified as a cause of constitutive receptor activity. To examine whether the underlying mechanism of receptor activation applies to all glycoprotein hormone receptors, we created deletion mutations in the LH and FSH receptors. In analogy to the situation with the TSH receptor, a deletion of nine amino acids resulted in constitutive activity irrespective of the location of deletions within the i3 loop of the LH receptor. In contrast, only one (Δ563–566) of four different 4-amino acid deletion mutants displayed agonist-independent activity. Systematic examination of the structural requirements for this effect in the Δ563–566 mutant revealed that only deletions including D564 resulted in constitutive receptor activity. Replacement of D564 by G, K, and N led to agonist-independent cAMP formation while introduction of a negatively charged E silenced constitutive receptor activity, indicating that an anionic amino acid at this position may be required to maintain an inactive receptor conformation. Insertion of A residues up- and downstream of D564 did not perturb receptor quiescence, showing that a certain degree of spatial freedom of the negatively charged amino acid within the context of the i3 loop is well tolerated. In contrast to the results obtained with the LH receptor, deletion of the corresponding D567 from the i3 loop of the FSH receptor did not cause constitutive receptor activation, highlighting significant differences in the activation mechanism of gonadotropin receptors." @default.
- W2005417512 created "2016-06-24" @default.
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- W2005417512 date "1999-02-01" @default.
- W2005417512 modified "2023-10-14" @default.
- W2005417512 title "Role of the Third Intracellular Loop for the Activation of Gonadotropin Receptors" @default.
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- W2005417512 doi "https://doi.org/10.1210/mend.13.2.0233" @default.
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