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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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Citations
Agonist-induced Threonine353/Threonine354 phosphorylation of the Somatostatin Receptor 2.
pT353/pT354-SST2 (phospho-Somatostatin Receptor...
Threonine353/Threonine354 (T353/T354) is a major phosphorylation site of the somatostatin receptor 2 (SST2). The pT353/pT354-SST2 antibody detects phosphorylation in response to high-efficacy agonists such as octreotide and low-efficacy...
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Agonist-induced Threonine356/Threonine359 phosphorylation of the Somatostatin Receptor 2.
pT356/pT359-SST2 (phospho-Somatostatin Receptor...
Threonine356/Threonine359 (T356/T359) is a major phosphorylation site of the somatostatin receptor 2 (SST2). The pT356/pT359-SST2 antibody detects phosphorylation in response to high-efficacy agonists such as octreotide and low-efficacy...
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KO-Validated
Western blot analysis of Somatostatin Receptor 2 in mouse brain in vivo.
SST2 (non-phospho), Somatostatin Receptor 2...
The non-phospho-SST2 receptor antibody is directed against the distal end of the carboxyl-terminal tail of mouse, rat and human SST2. It detects selectively the canonical form of SST2 (also referred to as SST2A) and not the putative...
$ 375.00 *
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Citations
Validation of the Parathyroid Hormone Receptor 1 in transfected HEK293 cells
PTH1 (non-phospho-Parathyroid Hormone Receptor...
The PTH1 antibody is directed against the distal end of the carboxyl-terminal tail of human Parathyroid Hormone Receptor 1. It can be used to detect total PTH1 receptors in Western blots independent of phosphorylation. The PTH1 antibody...
$ 375.00 *
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Citations
NEW
Detection of non-phosphorylated human GPR35 Receptor
GPR35 (non-phospho), G Protein-coupled Receptor...
The non-phospho-GPR35 receptor antibody is directed against the distal part of the carboxyl-terminal tail of human GPR35. It can be used to detect total GPR35 receptors in Western blots independent of phosphorylation. The...
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NEW
Agonist-induced Threonine401/Serine403 phosphorylation of Orexin Receptor 2
pT401/pS403-OX2 (phospho-Orexin Receptor 2...
Threonine401/Serine403 (T401/S403) is a major phosphorylation site of the Orexin receptor 2 (OX2). The pT401/pS403-OX2 antibody detects phosphorylation in response to high-efficacy agonists. T401/S403 phosphorylation is a key regulator...
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NEW
Agonist-induced Threonine408/Threonine409 phosphorylation of Orexin Receptor 2
pT408/pT409-OX2 (phospho-Orexin Receptor 2...
Threonine408/Threonine409 (T408/T409) is a major phosphorylation site of the Orexin receptor 2 (OX2). The pT408/pT409-OX2 antibody detects phosphorylation in response to high-efficacy agonists. T408/T409 phosphorylation is a key...
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NEW
Agonist-induced Serine385 phosphorylation of Orexin Receptor 1
pS385-OX1 (phospho-Orexin Receptor 1 Antibody)
Serine385 (S385) is a major phosphorylation site of the Orexin receptor 1 (OX1). The pS385-OX1 antibody detects phosphorylation in response to high-efficacy agonists. S385 phosphorylation is a key regulator of OX1 desensitization,...
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NEW
Agonist-induced Serine393/Serine394 phosphorylation of Orexin Receptor 1
pS393/pS394-OX1 (phospho-Orexin Receptor 1...
Serine393/Serine394 (S393/S394) is a major phosphorylation site of the Orexin receptor 1 (OX1). The pS393/pS394-OX1 antibody detects phosphorylation in response to high-efficacy agonists. S393/S394 phosphorylation is a key regulator of...
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NEW
Agonist-induced Serine399/Serine401 phosphorylation of Orexin Receptor 1
pS399/pS401-OX1 (phospho-Orexin Receptor 1...
Serine399/Serine401 (S399/S401) is a major phosphorylation site of the Orexin receptor 1 (OX1). The pS399/pS401-OX1 antibody detects phosphorylation in response to high-efficacy agonists. S399/S401 phosphorylation is a key regulator of...
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Citations
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 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,...
$ 375.00 *
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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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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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NEW
Agonist-induced Serine362/Serine363 phosphorylation of Ghrelin Receptor
pS362/pS363-GHSR (phospho-Ghrelin Receptor...
Serine362/Serine363 (S362/S363) is major phosphorylation site of the Ghrelin Receptor (GHSR). The pS362/pS363-GHSR antibody detects phosphorylation in response to agonists. S362/S363 phosphorylation is likely to be involved in efficient...
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Citations
NEW
Validation of the G protein-coupled Receptor 84 in transfected HEK293 cells
GPR84 (non-phospho), G Protein-Coupled Receptor...
The GPR84 antibody is directed against the distal end of the carboxyl-terminal tail of human GRP84. It can be used to detect total GPR84 receptors in Western blots independent of phosphorylation. The GPR84 antibody can also be used to...
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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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