Two barcodes encoded by the type-1 PDZ and by phospho-Ser312 regulate retromer/WASH-mediated sorting of the ß1-adrenergic receptor from endosomes to the plasma membrane

Mohammed M. Nooh, Suleiman Bahouth

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Recycling of the majority of agonist-internalized GPCR is dependent on a type I-PDZ “barcode” in their C-tail. The recycling of wild-type (WT) ß1-AR is also dependent on its default “type-1 PDZ barcode”, but trafficking of the ß1-AR is inhibited when PKA or its substrate serine at position 312 (Ser312) are inactivated. We tested the hypothesis that phospho-Ser312 provided a second barcode for ß1-AR sorting from endosomes to the plasma membrane by determining the role of retromer/WASH complexes in ß1-AR trafficking. Recycling of WT ß1-AR or WT ß2-AR was dependent on targeting the retromer to endosomal membranes via SNX3 and rab7a, and on complexing the retromer to the WASH pentamer via the C-tail of FAM21 (FAM21C). These maneuvers however, did not inhibit the recycling of a phospho-Ser312 ß1-AR mimic ((S312D) ß1-AR). Knockdown of the trans-acting PDZ protein sorting nexin27 (SNX27) inhibited the recycling of WT ß1-AR and WT ß2-AR, but had no effect on (S312D) ß1-AR ∆ PDZ or on phosphorylation of WT ß1-AR by PKA at Ser312. However, depletion of FKBP15, a FAM21C-binding endosomal protein, selectively inhibited WT ß1-AR but not ß2-AR recycling, suggesting divergence might exist in GPCR trafficking roadmaps. These results indicate that two barcodes are involved in sorting WT ß1-AR out of early endosomes. The first and antecedent “barcode” was the “type-1 PDZ”, followed by a second reversible “phospho-Ser312” verification “barcode”. This organization allows tight regulation of ß1-AR density to signaling intensity in conditions associated with aberrant ß1-AR signaling such as in hypertension and heart failure.

Original languageEnglish (US)
Pages (from-to)192-208
Number of pages17
JournalCellular Signalling
Volume29
DOIs
StatePublished - Jan 1 2017

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Endosomes
Adrenergic Receptors
Cell Membrane
Recycling
Amberlite XAD-2 resin
Protein Transport
Serine
Carrier Proteins
Heart Failure
Phosphorylation

All Science Journal Classification (ASJC) codes

  • Cell Biology

Cite this

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title = "Two barcodes encoded by the type-1 PDZ and by phospho-Ser312 regulate retromer/WASH-mediated sorting of the {\ss}1-adrenergic receptor from endosomes to the plasma membrane",
abstract = "Recycling of the majority of agonist-internalized GPCR is dependent on a type I-PDZ “barcode” in their C-tail. The recycling of wild-type (WT) {\ss}1-AR is also dependent on its default “type-1 PDZ barcode”, but trafficking of the {\ss}1-AR is inhibited when PKA or its substrate serine at position 312 (Ser312) are inactivated. We tested the hypothesis that phospho-Ser312 provided a second barcode for {\ss}1-AR sorting from endosomes to the plasma membrane by determining the role of retromer/WASH complexes in {\ss}1-AR trafficking. Recycling of WT {\ss}1-AR or WT {\ss}2-AR was dependent on targeting the retromer to endosomal membranes via SNX3 and rab7a, and on complexing the retromer to the WASH pentamer via the C-tail of FAM21 (FAM21C). These maneuvers however, did not inhibit the recycling of a phospho-Ser312 {\ss}1-AR mimic ((S312D) {\ss}1-AR). Knockdown of the trans-acting PDZ protein sorting nexin27 (SNX27) inhibited the recycling of WT {\ss}1-AR and WT {\ss}2-AR, but had no effect on (S312D) {\ss}1-AR ∆ PDZ or on phosphorylation of WT {\ss}1-AR by PKA at Ser312. However, depletion of FKBP15, a FAM21C-binding endosomal protein, selectively inhibited WT {\ss}1-AR but not {\ss}2-AR recycling, suggesting divergence might exist in GPCR trafficking roadmaps. These results indicate that two barcodes are involved in sorting WT {\ss}1-AR out of early endosomes. The first and antecedent “barcode” was the “type-1 PDZ”, followed by a second reversible “phospho-Ser312” verification “barcode”. This organization allows tight regulation of {\ss}1-AR density to signaling intensity in conditions associated with aberrant {\ss}1-AR signaling such as in hypertension and heart failure.",
author = "Nooh, {Mohammed M.} and Suleiman Bahouth",
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N2 - Recycling of the majority of agonist-internalized GPCR is dependent on a type I-PDZ “barcode” in their C-tail. The recycling of wild-type (WT) ß1-AR is also dependent on its default “type-1 PDZ barcode”, but trafficking of the ß1-AR is inhibited when PKA or its substrate serine at position 312 (Ser312) are inactivated. We tested the hypothesis that phospho-Ser312 provided a second barcode for ß1-AR sorting from endosomes to the plasma membrane by determining the role of retromer/WASH complexes in ß1-AR trafficking. Recycling of WT ß1-AR or WT ß2-AR was dependent on targeting the retromer to endosomal membranes via SNX3 and rab7a, and on complexing the retromer to the WASH pentamer via the C-tail of FAM21 (FAM21C). These maneuvers however, did not inhibit the recycling of a phospho-Ser312 ß1-AR mimic ((S312D) ß1-AR). Knockdown of the trans-acting PDZ protein sorting nexin27 (SNX27) inhibited the recycling of WT ß1-AR and WT ß2-AR, but had no effect on (S312D) ß1-AR ∆ PDZ or on phosphorylation of WT ß1-AR by PKA at Ser312. However, depletion of FKBP15, a FAM21C-binding endosomal protein, selectively inhibited WT ß1-AR but not ß2-AR recycling, suggesting divergence might exist in GPCR trafficking roadmaps. These results indicate that two barcodes are involved in sorting WT ß1-AR out of early endosomes. The first and antecedent “barcode” was the “type-1 PDZ”, followed by a second reversible “phospho-Ser312” verification “barcode”. This organization allows tight regulation of ß1-AR density to signaling intensity in conditions associated with aberrant ß1-AR signaling such as in hypertension and heart failure.

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