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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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Agonist-induced Serine377 phosphorylation of QRFP Receptor
pS377-QRFPR (phospho-QRFP Receptor Antibody)
Serine377 (S377) is a major phosphorylation site of the QRFP receptor. The pS377-QRFPR antibody detects phosphorylation in response to high-efficacy agonists. S377 phosphorylation is a key regulator of QRFPR desensitization, β-arrestin...
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Validation of the EP2 Receptor in transfected HEK293 cells
EP2 (non-phospho), EP2 Prostanoid Receptor...
The non-phospho-EP2 receptor antibody is directed against the distal end of the carboxyl-terminal tail of human EP2. It can be used to detect total EP2 receptors in Western blots independent of phosphorylation.The EP2 antibody can also...
$ 375.00 *
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Validation of the APLN Receptor in transfected HEK293 cells
APLNR (non-phospho), Apelin Receptor Antibody
The non-phospho-APLNR antibody is directed against the distal end of the carboxyl-terminal tail of human apelin receptor. It also detects APLNR in cultured cells and tissue sections by immunohistochemistry. It can be used to detect total...
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KO-Validated
Western blot analysis of Somatostatin Receptor 2 in mouse tissues in vivo
SST2 (GP-non-phospho), Somatostatin Receptor 2...
The GP-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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Validation of the CXCR3 Receptor in transfected HEK293 cells.
CXCR3 (non-phospho), CXCR3 Chemokine Receptor...
The non-phospho-CXCR3 receptor antibody is directed against the distal end of the carboxyl-terminal tail of human CXCR3. It can be used to detect total CXCR3 receptors in Western blots independent of phosphorylation.
$ 375.00 *
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Validation of the S1P1 Receptor in transfected HEK293 cells
S1P1 (non-phospho), Sphingosine 1-Phosphate...
The non-phospho-S1P1 receptor antibody is directed against the distal end of the carboxyl-terminal tail of human S1P1. It also detects S1P1 in cultured cells and tissue sections by immunohistochemistry. It can be used to detect total...
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Validation of the S1P5 Receptor in transfected HEK293 cells.
S1P5 (non-phospho), Sphingosine 1-Phosphate...
The non-phospho-S1P5 receptor antibody is directed against the distal end of the carboxyl-terminal tail of human S1P5. It can be used to detect total S1P5 receptors in Western blots independent of phosphorylation. The S1P5 antibody can...
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Validation of the EP4 Receptor in transfected HEK293 cells.
EP4 (non-phospho), EP4 Prostanoid Receptor...
The non-phospho-EP4 receptor antibody is directed against the distal end of the carboxyl-terminal tail of human EP4. It can be used to detect total EP4 receptors in Western blots independent of phosphorylation.
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Validation of the GPR183 Receptor in transfected HEK293 cells
GPR183 (non-phospho), Oxysterol Receptor Antibody
The non-phospho-GPR183 receptor antibody is directed against the distal end of the carboxyl-terminal tail of human GPR183. It also detects GPR183 in cultured cells and tissue sections by immunohistochemistry. It can be used to detect...
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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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Validation of the Tachykinin Receptor 1 in transfected HEK293 cells
NK1 (non-phospho), Tachykinin Receptor 1 Antibody
The NK1 antibody is directed against the distal end of the carboxyl-terminal tail of human Tachykinin Receptor 1 (also called Substance P Receptor). It detects selectively the canonical full-length NK1 Tachykinin Receptor. It can be used...
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Agonist-induced Threonine356/Threonine357 phosphorylation of NK1 Receptor
pT356/pT357-NK1 (phospho-Tachykinin Receptor 1...
Threonine356/Threonine357 (T356/T357) is a major phosphorylation site of the NK1 receptor. The pT356/pT357-NK1 antibody detects phosphorylation in response to high-efficacy agonists. T356/T357 phosphorylation is a key regulator of NK1...
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Agonist-induced Serine338/Threonine339 phosphorylation of NK1 Receptor
pS338/pT339-NK1 (phospho-Tachykinin Receptor 1...
Serine338/Threonine339 (S338/T339) is a major phosphorylation site of the NK1 receptor. The pS338/pT339-NK1 antibody detects phosphorylation in response to high-efficacy agonists. S338/T339 phosphorylation is a key regulator of NK1...
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pT344/pS347-NK1 (phospho-Tachykinin Receptor 1 Antibody)
pT344/pS347-NK1 (phospho-Tachykinin Receptor 1...
Threonine344/Serine347 (T344/S347) is a major phosphorylation site of the NK1 receptor. The pT344/pS347-NK1 antibody detects phosphorylation in response to high-efficacy agonists. T344/S347 phosphorylation is a key regulator of NK1...
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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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Premium Phosphosite-Specific 7TM Antibodies

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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