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- W2063586990 abstract "To understand the biochemical basis for the functional divergence of the human endothelin receptor subtypes A (ETAR) and B (ETBR), they were expressed, purified from insect Sf9 cells, and reconstituted into phospholipid vesicles with the Go, Gq, and Gi proteins. For each G protein, a unique pattern of reactivity was observed with the different receptor subtypes. Both ETAR and ETBR activated Go to a similar maximal extent, and both subtypes activated Gq with similar EC50 values; however, the ETAR displayed a 2−3-fold higher maximal extent of activation. In contrast, both subtypes activated Gi to a similar maximal extent, but the ETAR displayed a 4-fold higher EC50 value as compared to the ETBR. To test whether these coupling specificities are influenced by C-terminal palmitoylation of the receptor, we mutated a cluster of cysteine residues near the end of the seventh transmembrane helix in both receptors. While the cysteine mutations in the ETBR resulted in a partially palmitoylated receptor, the replacement of these cysteine residues in the ETAR yielded a mostly palmitoyl-deficient receptor and had no effect on Go activation, but caused a reduction in the extents of Gi and Gq stimulation. Together, these studies provide important insights into the specificity of G protein coupling in the endothelin receptors. The ability to discriminate between the different G proteins under various physiological conditions may be a key element in the selection of distinct signal transduction pathways by the two receptor subtypes." @default.
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- W2063586990 date "1999-02-19" @default.
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- W2063586990 title "Interactions of Endothelin Receptor Subtypes A and B with G<sub>i</sub>, G<sub>o</sub>, and G<sub>q</sub> in Reconstituted Phospholipid Vesicles" @default.
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- W2063586990 doi "https://doi.org/10.1021/bi981919m" @default.
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