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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 Serine363/Threonine364 phosphorylation of the Bombesin Receptor 2
pS363/pT364-BB2 (phospho-Bombesin Receptor 2...
Serine363/Threonine364 (S363/T364) is major phosphorylation site of the Bombesin Receptor 2 (BB2). The pS363/pT364-BB2 antibody detects phosphorylation in response to agonists. S363/T364 phosphorylation is likely to be involved in...
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Agonist-induced Threonine343/Serine347/Threonine348 phosphorylation of the 5-Hydroxytryptamine Receptor 4
pT343/pS347/pT348-5-HT4 (phospho-5-HT Receptor...
Threonine343/Serine347/Threonine348 is a major phosphorylation site of the 5-HT4 receptor. The pT343/pS347/pT348-5-HT4 antibody detects phosphorylation in response to high-efficacy agonists but not after PKC activation. T343/S347/T348...
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Agonist-induced Serine354/Threonine355 phosphorylation of the 5-Hydroxytryptamine Receptor 4
pS354/pT355-5-HT4 (phospho-5-HT Receptor 4...
Serine354/Threonine355 is a major phosphorylation site of the 5-HT4 receptor. The pS354/pT355-5-HT4 antibody detects phosphorylation in response to high-efficacy agonists but not after PKC activation. S354/T355 phosphorylation is a key...
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Immunohistochemical identification of MRGPRX2 Receptor in Pancreas
MRGPRX2 (GP-IHC-grade), MRGPRX2 Mas-related...
The non-phospho-MRGPRX2 receptor antibody is directed against the distal end of the carboxyl-terminal tail of human MRGPRX2. It can be used to detect total MRGPRX2 receptors in Western blots independent of phosphorylation. The MRGPRX2...
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Immunohistochemical identification of Somatostatin Receptor 2 in human neuroendocrine tumor tissue
SST2 (GP-IHC-grade), Somatostatin Receptor 2...
The SST2 receptor antibody is directed against the distal end of the carboxyl-terminal tail of human Somatostatin Receptor 2. It detects selectively the canonical form of SST2 (also referred to as SST2A) and not the putative splice...
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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...
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KO-Validated
Immunohistochemical identification of µ-Opioid Receptor in Striatum
MOP (GP-IHC-grade), µ-Opioid Receptor Antibody,...
The 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. In can be used to...
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KO-Validated
Validation of the µ-Opioid Receptor in transfected HEK293 cells
MOP (GP-non-phospho), µ-Opioid Receptor...
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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Validation of the MRGPRX2 Receptor in transfected HEK293 cells
MRGPRX2 (GP-non-phospho), MRGPRX2 Mas-related...
The non-phospho-MRGPRX2 receptor antibody is directed against the distal end of the carboxyl-terminal tail of human MRGPRX2. It can be used to detect total MRGPRX2 receptors in Western blots independent of phosphorylation. The MRGPRX2...
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Validation of the Formylpeptide Receptor 2 in transfected HEK293 cells
FPR2 (GP-non-phospho), Formylpeptide Receptor 2...
The FPR2 receptor antibody is directed against the distal end of the carboxyl-terminal tail of human Formylpeptide Receptor 2. It can be used to detect total FPR2 receptors in Western blots independent of phosphorylation. The FPR2...
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Validation of the Atypical Chemokine Receptor 3 in transfected HEK293 cells
ACKR3 (GP-non-phos, C-Term), Atypical Chemokine...
The non-phospho-ACKR3 receptor antibody is directed against the carboxyl-terminal tail of mouse, rat and human ACKR3. It can be used to detect total ACKR3 receptors in Western blots independent of phosphorylation. The non-phospho-ACKR3...
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NTS1 (GP-IHC-grade), Neurotensin Receptor 1 Antibody, Guinea Pig
NTS1 (GP-IHC-grade), Neurotensin Receptor 1...
The NTS1 receptor antibody is directed against the distal end of the carboxyl-terminal tail of human Neurotensin Receptor 1. It can be used to detect total NTS1 receptors in Western blots independent of phosphorylation. The NTS1 antibody...
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NTS1 (GP-non-phospho), Neurotensin Receptor 1 Antibody, Guinea Pig
NTS1 (GP-non-phospho), Neurotensin Receptor 1...
The NTS1 receptor antibody is directed against the distal end of the carboxyl-terminal tail of human Neurotensin Receptor 1. It can be used to detect total NTS1 receptors in Western blots independent of phosphorylation. The NTS1 antibody...
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Immunohistochemical identification of Corticotropin-Releasing Factor Receptor 1 in anterior pituitary
CRF1 (IHC-grade), Corticotropin-Releasing...
The CRF1 receptor antibody is directed against the distal part of the carboxyl-terminal tail of human CRF1. It can be used to detect total CRF1 receptors in Western blots independent of phosphorylation. The CRF1 antibody can also be used...
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Citations
Validation of the Neurotensin Receptor 1 in transfected HEK293 cells
NTS1 (non-phospho), Neurotensin Receptor 1...
The NTS1 receptor antibody is directed against the distal end of the carboxyl-terminal tail of human Neurotensin Receptor 1. It can be used to detect total NTS1 receptors in Western blots independent of phosphorylation. The NTS1 antibody...
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Immunohistochemical identification of Proteinase-Activated Receptor 4 in Small Intestine
PAR4 (IHC-Grade), Proteinase-Activated Receptor...
The non-phospho-PAR4 receptor antibody is directed against the distal end of the carboxyl-terminal tail of human Proteinase-Activated Receptor 4. It can be used to detect total PAR4 receptors in Western blots independent of...
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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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