Substitution of an extracellular cysteine in the beta 2-adrenergic receptor enhances agonist-promoted phosphorylation and receptor desensitization.


We constructed and expressed in a permanent cell line a beta 2-adrenergic receptor with a valine substitution for cysteine 184 of the second putative extracellular loop. The mutant receptor was partially uncoupled from adenylyl cyclase with impaired ability to form the high affinity agonist-receptor-G protein complex, yet displayed more rapid and extensive… (More)


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