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• W1547113602 abstract "The luteinizing hormone/choriogonadotropin (CG) receptor belongs to a subfamily of glycoprotein hormone receptors within the seven-transmembrane receptor family. It is comprised of an extracellular N-terminal half of 341 amino acids and a membrane-associated C-terminal half of 303 amino acids. The N-terminal half is capable of high affinity hormone binding whereas the C-terminal half is capable of low affinity hormone binding and receptor activation. However, the precise location of the receptor activation site is currently unknown. We present evidence for the first time that Lys583 of exoloop 3 is crucial and irreplaceable for receptor activation to induce cAMP synthesis. Exoloop 3 is comprised of 11 amino acids and flanked by two Lys residues, Lys573 and Lys583, that are located at the boundaries with the transmembrane columns 6 and 7, respectively. All substitutions including Arg for Lys583 did not affect the high affinity human CG binding, but they resulted in the complete loss of cAMP synthesis induced by human CG. Ala substitutions of the other amino acids in exoloop 3 did not make such a dramatic impact on cAMP induction. The Ala scan revealed two distinct groups of amino acids in terms of their importance in cAMP induction, one group being more important than the other. Interestingly, these two groups of amino acids are arranged in an alternate sequence. This result suggests a specific structure similar to a β-like structure for exoloop 3. The luteinizing hormone/choriogonadotropin (CG) receptor belongs to a subfamily of glycoprotein hormone receptors within the seven-transmembrane receptor family. It is comprised of an extracellular N-terminal half of 341 amino acids and a membrane-associated C-terminal half of 303 amino acids. The N-terminal half is capable of high affinity hormone binding whereas the C-terminal half is capable of low affinity hormone binding and receptor activation. However, the precise location of the receptor activation site is currently unknown. We present evidence for the first time that Lys583 of exoloop 3 is crucial and irreplaceable for receptor activation to induce cAMP synthesis. Exoloop 3 is comprised of 11 amino acids and flanked by two Lys residues, Lys573 and Lys583, that are located at the boundaries with the transmembrane columns 6 and 7, respectively. All substitutions including Arg for Lys583 did not affect the high affinity human CG binding, but they resulted in the complete loss of cAMP synthesis induced by human CG. Ala substitutions of the other amino acids in exoloop 3 did not make such a dramatic impact on cAMP induction. The Ala scan revealed two distinct groups of amino acids in terms of their importance in cAMP induction, one group being more important than the other. Interestingly, these two groups of amino acids are arranged in an alternate sequence. This result suggests a specific structure similar to a β-like structure for exoloop 3." @default.
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• W1547113602 date "1996-03-01" @default.
• W1547113602 modified "2023-10-02" @default.
• W1547113602 title "Exoloop 3 of the Luteinizing Hormone/Choriogonadotropin Receptor" @default.
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• W1547113602 doi "https://doi.org/10.1074/jbc.271.13.7301" @default.
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