Unknown

Dataset Information

0

Alternative splicing determines the post-endocytic sorting fate of G-protein-coupled receptors.


ABSTRACT: Mu-type opioid receptors are physiologically important G-protein-coupled receptors that are generally thought to recycle after agonist-induced endocytosis. Here we show that several alternatively spliced receptor variants fail to do so efficiently because of splice-mediated removal of an endocytic sorting sequence that is present specifically in the MOR1 variant. All of the recycling-impaired receptor variants were found to undergo proteolytic down-regulation more rapidly than MOR1, irrespective of moderate differences in endocytic rate, indicating that alternative splicing plays a specific role in distinguishing the trafficking itinerary of receptors after endocytosis. The recycling-impaired MOR1B variant was similar to MOR1 in its ability to mediate opioid-dependent inhibition of adenylyl cyclase, and to undergo opioid-induced desensitization in intact cells. Functional recovery (resensitization) of MOR1B-mediated cellular responsiveness after opioid removal, however, was significantly impaired (4-fold reduction in rate) compared with MOR1. To our knowledge the present results are the first to establish a role of alternative RNA processing in specifying the post-endocytic sorting of G-protein-coupled receptors between divergent and functionally distinct membrane pathways.

SUBMITTER: Tanowitz M 

PROVIDER: S-EPMC2602910 | biostudies-literature |

REPOSITORIES: biostudies-literature

Similar Datasets

| S-EPMC4846350 | biostudies-literature
| S-EPMC2278184 | biostudies-literature
| S-EPMC535095 | biostudies-literature
| S-EPMC2740561 | biostudies-literature
| S-EPMC2685686 | biostudies-literature
| S-EPMC4961580 | biostudies-literature
| S-EPMC2613619 | biostudies-literature
| S-EPMC3575409 | biostudies-literature
| S-EPMC6138936 | biostudies-literature
| S-EPMC7181866 | biostudies-literature