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• W2048473041 abstract "The motilin receptor belongs to a family of Class I G protein-coupled receptors, and is an important endogenous regulator of gastrointestinal motor function. Motilin and erythromycin, two chemically distinct full agonists of the motilin receptor, are known to bind to distinct regions of this receptor, based on previous systematic mutagenesis of extracellular regions that dissociated the effects on these two agents. The action of these different chemical classes of agonists likely yields a common activation state of the cytosolic face of this receptor that is responsible for interaction with its G protein. In the current work, we studied the predicted transmembrane (TM) domains of this receptor for functional responses to motilin and erythromycin. Motilin receptor constructs were prepared in which each residue in the TM domains was mutated to alanine or valine. Each construct was expressed in COS cells and characterized for motilin and erythromycin binding and intracellular calcium responses stimulated by both agonists. Constructs with mutations of residues, Asp94, Leu95, Arg97 and Trp99 in TM2, Ser169 in TM4, and Tyr321 and Glu325 in TM6, were responsible for the negative impact on biological activity stimulated by erythromycin, but had no effect on motilin responses. On the other hand, constructs with mutations of residues, Leu113 in TM3, Pro172 in TM4, Trp250 and Tyr255 in TM5, and Gln334 in TM7, were negatively responsive to both erythromycin and motilin. These data support important roles of new regions in the TM domains of the motilin receptor for erythromycin action, suggesting differential mechanisms of actions by peptidyl and non-peptidyl ligands." @default.
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• W2048473041 date "2013-01-01" @default.
• W2048473041 modified "2023-09-24" @default.
• W2048473041 title "Critical residues in the transmembrane helical bundle domains of the human motilin receptor for erythromycin binding and activity" @default.
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• W2048473041 doi "https://doi.org/10.1016/j.regpep.2012.10.003" @default.
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