Trafficking of preassembled opioid mu-delta heterooligomer-Gz signaling complexes to the plasma membrane: coregulation by agonists.

The cellular site of formation, Galpha-coupling preference, and agonist regulation of mu-delta opioid receptor (OR) heterooligomers were studied. Bioluminescence resonance energy transfer (BRET) showed that mu-deltaOR heterooligomers, composed of preformed mu and delta homooligomers, interacted constitutively in the endoplasmic reticulum (ER) with Galpha-proteins forming heteromeric signaling complexes before being targeted to the plasma membrane. Compared to muOR homooligomers, the mu-delta heterooligomers showed higher affinity and efficiency of interaction for Gz over Gi, indicating a switch in G-protein preference. Treatment with DAMGO or deltorphin II led to coregulated internalization of both receptors, whereas DPDPE and DSLET had no effect on mu-delta internalization. Staggered expression resulted in non-interacting mu and delta receptors, even though both receptors were colocalized at the cell surface. Agonists failed to induce BRET between staggered receptors, and resulted in internalization solely of the receptor targeted by agonist. Thus, mu-deltaOR heterooligomers form and preferentially associate with Gz to generate a signaling complex in the ER, and have a distinct agonist-internalization profile compared to either mu or delta homooligomers.

• Publication year

  2007

• Venue

  Biochemistry

• Publication date

  Unknown publication date

• Fields of study

  Medicine, Chemistry

• Identifiers
  DOI 10.1021/bi701436w.s005PMID 17941650
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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