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Matches in SemOpenAlex for { <https://semopenalex.org/work/W1998996859> ?p ?o ?g. }

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• W1998996859 abstract "Sequence alignment shows that there is a highly conserved aspartate in the second transmembrane helix of virtually all G protein-coupled receptors. A previous study on the alpha 2-adrenergic receptor demonstrated that substitution of this acidic residue for the corresponding amide slightly decreases the affinity of the receptor for agonists and completely abolishes the effect of Na+ on the affinity for agonists. Since we have previously shown that Na+ modulates the binding affinity of the LH/CG receptor for ovine LH (oLH) [but not for human CG (hCG)], the experiments described here were designed to determine if the corresponding residue (D383) of the rat LH/CG receptor also mediates this Na+ effect. We used site-directed mutagenesis to create an LH/CG receptor mutant in which D383 was substituted by N. The wild type and mutant receptor [designated rLHR(D383N)] were expressed in human embryonic kidney 293 cells, and the transfected cells were tested for their ability to bind hCG and oLH in medium containing Na+ or an isoosmolar concentration of an appropriate sodium substitute. The results presented here show that this single point mutation of the LH/CG receptor leads to a slight reduction in affinity for hCG and oLH but completely abolishes the effects of Na+ removal on the affinity for oLH. Thus, regardless of the presence or absence of Na+, cells expressing rLHR(D383N) bind oLH with a low affinity comparable to that of the wild type receptor assayed in the presence of Na+. We also measured the ability of hCG and oLH to increase cAMP accumulation in cells expressing the wild type and mutant receptors.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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• W1998996859 date "1993-06-01" @default.
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• W1998996859 title "The regulation of the binding affinity of the luteinizing hormone/choriogonadotropin receptor by sodium ions is mediated by a highly conserved aspartate located in the second transmembrane domain of G protein-coupled receptors." @default.
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• W1998996859 doi "https://doi.org/10.1210/mend.7.6.8395653" @default.
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