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Phosphorylation of intracellular serine and threonine residues is the most important post translational modification of G protein-coupled receptors (GPCRs) also called heptahelical or seven transmembrane receptors (7TMR). After agonist exposure, these receptors acquire an active conformation, which is recognized by a family of highly specialized GPCR kinases (GRKs). Agonist-driven phosphorylation by GRKs regulates acute receptor desensitization, arrestin recruitment, internalization, post-activation signaling, long-term tolerance and drug addiction. Phosphosite-specific 7TM antibodies are designed to specifically detect agonist-activated GPCRs. In fact, recent work shows that ligand profiling using phosphosite-specific 7TM antibodies provides valuble information on ligand bias beyond that obtained with conventional ß-arrestin recruitment assays. Phosphosite-specific 7TM antibodies are novel tools for GPCR research that can be used to:

  • profile agonist properties of novel GPCR ligands
  • decipher the phosphorylation barcode of GPCRs
  • determine the spatial and temporal dynamics of receptor phosphorylation
  • identify relevant kinases and phosphatases for GPCR phosphorylation and dephosphoryation

Lifecycle3

Schematic representation of the G protein-coupled receptor phosphorylation / dephosphorylation cycle. GRK, G protein-coupled receptor kinase; PKC, protein kinase C; cPP1, catalytic subunit of protein phosphatase 1; R*, activated GPCR; CCP, clathrin-coated pit. 

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pS412/pS414-CCK1 (phospho-Cholecystokinin Receptor 1 Antibody)
pS412/pS414-CCK1 (phospho-Cholecystokinin...
Serine412/Serine414 (S412/S414) is a major phosphorylation site of the CCK1 receptor. The pS412/pS414-CCK1 antibody detects phosphorylation in response to high-efficacy agonists. S412/S414 phosphorylation is a key regulator of CCK1...
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Figure 1. Agonist-induced and Agonist-independent Serine363 phosphorylation of the µ-Opioid Receptor
pS363-MOP (phospho-µ-Opioid Receptor Antibody)
Serine363 (S363) is a constitutive phosphorylation site of the µ-opioid receptor (MOP). The pT363-MOP antibody detects phosphorylated MOP in cultured cells. S363 is a substrate for PKC-mediated phosphorylation.
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KO-Validated
Validation of the CXC Chemokine Receptor 4 in transfected HEK293 cells.
CXCR4 (non-phospho), CXC Chemokine Receptor 4...
The non-phospho-CXCR4 receptor antibody is directed against the distal end of the carboxyl-terminal tail of mouse, rat and human CXCR4. It can be used to detect CXCR4 receptors in Western blots in a phosphorylation-sensitive manner....
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pS346/pS347-CXCR4 (phospho-CXC Chemokine Receptor 4 Antibody)
pS346/pS347-CXCR4 (phospho-CXC Chemokine...
Serine346/serine347 (S346/S347) is a major phosphorylation site of the CXCR4 receptor. The pS346/pS347-CXCR4 antibody detects phosphorylation in response to agonists and after PKC activation. S346/S347 phosphorylation is a key regulator...
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Agonist-induced Serine324/Serine325 phosphorylation of the CXC Chemokine Receptor 4.
pS324/pS325-CXCR4 (phospho-CXC Chemokine...
Serine324/serine325 (S324/S325) is a major phosphorylation site of the CXCR4 receptor. The pS324/pS325-CXCR4 antibody detects phosphorylation in response to agonists but not after PKC activation. S324/S325 phosphorylation is a key...
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Agonist-induced Threonine379 phosphorylation of the µ-Opioid Receptor.
pT379-MOP (phospho-µ-Opioid Receptor Antibody)
Threonine379 (T379) is a major phosphorylation site of the µ-opioid receptor (MOP). The pT379-MOP antibody detects phosphorylation in response to high-efficacy agonists but to low-efficacy agonists or after PKC activation. T379...
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Agonist-induced Threonine376 phosphorylation of the µ-Opioid Receptor.
pT376-MOP (phospho-µ-Opioid Receptor Antibody)
Threonine376 (T376) is a major phosphorylation site of the µ-opioid receptor (MOP). The pT376-MOP antibody detects phosphorylation in response to high-efficacy agonists but to low-efficacy agonists or after PKC activation. T376...
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Figure 1. Agonist-induced Threonine370 phosphorylation of the µ-opioid receptor.
pT370-MOP (phospho-µ-Opioid Receptor Antibody)
Threonine370 (T370) is a major phosphorylation site of the µ-opioid receptor (MOP). The pT370-MOP antibody detects phosphorylation in response to high-efficacy agonists but to low-efficacy agonists. The pT370-MOP antibody also detects...
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KO-Validated
MOP (non-phospho), µ-Opioid Receptor Antibody
MOP (non-phospho), µ-Opioid Receptor Antibody
The non-phospho-µ-opioid receptor antibody is directed against the distal end of the carboxyl-terminal tail of mouse, rat and human MOP. It detects selectively the canonical form of MOP and none of the putative splice variants. It can be...
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Agonist-induced Threonine363 phosphorylation of the κ-Opioid Receptor.
pT363-KOP (phospho-κ-Opioid Receptor Antibody)
Threonine363 is a major phosphorylation site of the kappa-opioid receptor (KOP). The pT363-KOP antibody detects phosphorylation in response to high-efficacy agonists. T363 phosphorylation is a key regulator of KOP desensitization,...
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Agonist-induced Serine356/Threonine357 phosphorylation of the κ-Opioid Receptor.
pS356/pT357-KOP (phospho-κ-Opioid Receptor...
Serine356/Threonine357 is a major phosphorylation site of the kappa-opioid receptor (KOP). The pS356/pT357-KOP antibody detects phosphorylation in response to agonists as well as after PKC activation. S356/T357 phosphorylation is a key...
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Agonist-induced Serine351 phosphorylation of the Nociceptin/Orphanin FQ Receptor.
pS351-NOP (phospho-Nociceptin/Orphanin FQ...
Serine351 (S351) is a major phosphorylation site of the nociceptin/orphanin FQ peptide receptor (NFQ receptor, NOP). The pS351-NOP antibody detects phosphorylation in response to agonists as well as after PKC activation. S351...
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Agonist-induced Serine346 phosphorylation of the Nociceptin/Orphanin FQ Receptor.
pS346-NOP (phospho-Nociceptin/Orphanin FQ...
Serine346 (S346) is a major phosphorylation site of the nociceptin/orphanin FQ peptide receptor (NFQ receptor, NOP). The pS346-NOP antibody detects phosphorylation in response to agonists as well as after PKC activation. S346...
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pT348-SST3 (phospho-Somatostatin Receptor 3 Antibody)
pT348-SST3 (phospho-Somatostatin Receptor 3...
Threonine348 (T348) is a major phosphorylation site of the somatostatin receptor 3 (SST3). The pT348-SST3 antibody detects phosphorylation in response to high- and low-efficacy agonists but not after PKC activation. T348 phosphorylation...
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pS337/pT341-SST3 (phospho-Somatostatin Receptor 3 Antibody)
pS337/pT341-SST3 (phospho-Somatostatin Receptor...
Serine337/Threonine341 (S337/T341) is a major phosphorylation site of the somatostatin receptor 3 (SST3). The pS337/pT341-SST3 antibody detects phosphorylation in response to high- and low-efficacy agonists but not after PKC activation....
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KO-Validated
Validation of the Somatostatin Receptor 5 in transfected HEK293 cells.
SST5 (non-phospho), Somatostatin Receptor 5...
The non-phospho-SST5 receptor antibody is directed against the distal end of the carboxyl-terminal tail of human SST5. In can be used to detect total SST5 receptors in Western blots independent of phosphorylation. The non-phospho-SST5...
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For further reading refer to:

Kliewer A, Reinscheid RK, Schulz S. Emerging Paradigms of G Protein-Coupled Receptor Dephosphorylation. Trends Pharmacol Sci. 2017 Jul;38(7):621-636. doi:10.1016/j.tips.2017.04.002. Epub 2017 May 4. Review. PubMed PMID: 28478994.

Miess E, Gondin AB, Yousuf A, Steinborn R, Mösslein N, Yang Y, Göldner M, Ruland JG, Bünemann M, Krasel C, Christie MJ, Halls ML, Schulz S, Canals M. Multisite phosphorylation is required for sustained interaction with GRKs and arrestins during rapid μ-opioid receptor desensitization. Sci Signal. 2018 Jul 17;11(539). pii: eaas9609. doi: 10.1126/scisignal.aas9609. PubMed PMID: 30018083.

Kliewer A, Schmiedel F, Sianati S, Bailey A, Bateman JT, Levitt ES, Williams JT, Christie MJ, Schulz S. Phosphorylation-deficient G-protein-biased μ-opioid receptors improve analgesia and diminish tolerance but worsen opioid side effects. Nat Commun. 2019 Jan 21;10(1):367. doi: 10.1038/s41467-018-08162-1. PubMed PMID: 30664663; PubMed Central PMCID: PMC6341117.

Mann A, Moulédous L, Froment C, O'Neill PR, Dasgupta P, Günther T, Brunori G, Kieffer BL, Toll L, Bruchas MR, Zaveri NT, Schulz S. Agonist-selective NOP receptor phosphorylation correlates in vitro and in vivo and reveals differential post-activation signaling by chemically diverse agonists. Sci Signal. 2019 Mar 26;12(574). pii: eaau8072. doi: 10.1126/scisignal.aau8072. PubMed PMID: 30914485; PubMed Central PMCID: PMC6934085.

Saaber F, Schütz D, Miess E, Abe P, Desikan S, Ashok Kumar P, Balk S, Huang K, Beaulieu JM, Schulz S, Stumm R. ACKR3 Regulation of Neuronal Migration Requires ACKR3 Phosphorylation, but Not β-Arrestin. Cell Rep. 2019 Feb 5;26(6):1473-1488.e9. doi: 10.1016/j.celrep.2019.01.049. PubMed PMID: 30726732.

Glück L, Loktev A, Moulédous L, Mollereau C, Law PY, Schulz S. Loss of morphine reward and dependence in mice lacking G protein-coupled receptor kinase 5. Biol Psychiatry. 2014 Nov 15;76(10):767-74. doi: 10.1016/j.biopsych.2014.01.021. Epub 2014 Feb 3. PubMed PMID: 24629717; PubMed Central PMCID: PMC4119866.

For further reading refer to: Kliewer A, Reinscheid RK, Schulz S. Emerging Paradigms of G Protein-Coupled Receptor Dephosphorylation. Trends Pharmacol Sci. 2017 Jul;38(7):621-636.... read more »
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For further reading refer to:

Kliewer A, Reinscheid RK, Schulz S. Emerging Paradigms of G Protein-Coupled Receptor Dephosphorylation. Trends Pharmacol Sci. 2017 Jul;38(7):621-636. doi:10.1016/j.tips.2017.04.002. Epub 2017 May 4. Review. PubMed PMID: 28478994.

Miess E, Gondin AB, Yousuf A, Steinborn R, Mösslein N, Yang Y, Göldner M, Ruland JG, Bünemann M, Krasel C, Christie MJ, Halls ML, Schulz S, Canals M. Multisite phosphorylation is required for sustained interaction with GRKs and arrestins during rapid μ-opioid receptor desensitization. Sci Signal. 2018 Jul 17;11(539). pii: eaas9609. doi: 10.1126/scisignal.aas9609. PubMed PMID: 30018083.

Kliewer A, Schmiedel F, Sianati S, Bailey A, Bateman JT, Levitt ES, Williams JT, Christie MJ, Schulz S. Phosphorylation-deficient G-protein-biased μ-opioid receptors improve analgesia and diminish tolerance but worsen opioid side effects. Nat Commun. 2019 Jan 21;10(1):367. doi: 10.1038/s41467-018-08162-1. PubMed PMID: 30664663; PubMed Central PMCID: PMC6341117.

Mann A, Moulédous L, Froment C, O'Neill PR, Dasgupta P, Günther T, Brunori G, Kieffer BL, Toll L, Bruchas MR, Zaveri NT, Schulz S. Agonist-selective NOP receptor phosphorylation correlates in vitro and in vivo and reveals differential post-activation signaling by chemically diverse agonists. Sci Signal. 2019 Mar 26;12(574). pii: eaau8072. doi: 10.1126/scisignal.aau8072. PubMed PMID: 30914485; PubMed Central PMCID: PMC6934085.

Saaber F, Schütz D, Miess E, Abe P, Desikan S, Ashok Kumar P, Balk S, Huang K, Beaulieu JM, Schulz S, Stumm R. ACKR3 Regulation of Neuronal Migration Requires ACKR3 Phosphorylation, but Not β-Arrestin. Cell Rep. 2019 Feb 5;26(6):1473-1488.e9. doi: 10.1016/j.celrep.2019.01.049. PubMed PMID: 30726732.

Glück L, Loktev A, Moulédous L, Mollereau C, Law PY, Schulz S. Loss of morphine reward and dependence in mice lacking G protein-coupled receptor kinase 5. Biol Psychiatry. 2014 Nov 15;76(10):767-74. doi: 10.1016/j.biopsych.2014.01.021. Epub 2014 Feb 3. PubMed PMID: 24629717; PubMed Central PMCID: PMC4119866.

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