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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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Validation of the Calcitonin Receptor-Like Receptor in transfected HEK293 cells
CALCR (GP-non-phospho) Calcitonin Receptor-Like...
The non-phospho-CALCR receptor antibody is directed against the distal end of the carboxyl-terminal tail of human CALCR. It can be used to detect total CALCR receptors in Western blots independent of phosphorylation. The CALCR antibody...
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A2A (GP-non-phospho) Adenosine 2A Receptor Antibody, Guinea Pig
A2A (GP-non-phospho) Adenosine 2A Receptor...
The non-phospho-A2A receptor antibody is directed against the distal end of the carboxyl-terminal tail of human A2A. It can be used to detect total A2A receptors in Western blots independent of phosphorylation. The A2A antibody can also...
375.00 € *
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CALCR (IHC-grade) Calcitonin Receptor-Like Receptor Antibody
CALCR (IHC-grade) Calcitonin Receptor-Like...
The non-phospho-CALCR receptor antibody is directed against the distal end of the carboxyl-terminal tail of human CALCR. It can be used to detect total CALCR receptors in Western blots independent of phosphorylation. The CALCR antibody...
375.00 € *
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NEW
Validation of the Calcitonin Receptor-Like Receptor in transfected HEK293 cells
CALCR (non-phospho) Calcitonin Receptor-Like...
The non-phospho-CALCR receptor antibody is directed against the distal end of the carboxyl-terminal tail of human CALCR. It can be used to detect total CALCR receptors in Western blots independent of phosphorylation. The CALCR antibody...
375.00 € *
Details
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Agonist-induced Serine329 phosphorylation of the A2A Adenosine Receptor
pS329-A2A (phospho-A2A Adenosine Receptor...
Serine329 is a major phosphorylation site of the A2A Adenosine receptor. The pS329-A2A antibody detects phosphorylation in response to high-efficacy agonists but not after PKC activation. S329 phosphorylation is a key regulator of A2A...
375.00 € *
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Validation of the A2A Adenosine Receptor in transfected HEK293 cells
A2A (non-phospho) Adenosine 2A Receptor Antibody
The non-phospho-A2A receptor antibody is directed against the distal end of the carboxyl-terminal tail of human A2A. It can be used to detect total A2A receptors in Western blots independent of phosphorylation. The A2A antibody can also...
375.00 € *
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Immunohistochemical identification of the A2A Adenosine Receptor in human cortex
A2A (IHC-grade), Adenosine 2A Receptor Antibody
The non-phospho-A2A receptor antibody is directed against the distal end of the carboxyl-terminal tail of human A2A. It can be used to detect total A2A receptors in Western blots independent of phosphorylation. The A2A antibody can also...
375.00 € *
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SMO (non-phospho) Smoothened Receptor Antibody
SMO (non-phospho) Smoothened Receptor Antibody
The non-phospho SMO receptor antibody is directed against the distal end of the carboxyl-terminal tail human SMO receptor. It can be used to detect total SMO receptors in Western blots independent of phosphorylation. It can also be used...
375.00 € *
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SMO (GP-non-phospho) Smoothened Receptor Antibody, Guinea Pig
SMO (GP-non-phospho) Smoothened Receptor...
The non-phospho SMO receptor antibody is directed against the distal end of the carboxyl-terminal tail human SMO receptor. It can be used to detect total SMO receptors in Western blots independent of phosphorylation. It can also be used...
375.00 € *
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HCA2 (IHC-grade), Hydroxycarboxylic Acid Receptor 2 Antibody
HCA2 (IHC-grade), Hydroxycarboxylic Acid...
The non-phospho HCA2 receptor antibody is directed against the distal end of the carboxyl-terminal tail human HCA2 receptor. It can be used to detect total HCA2 receptors in Western blots independent of phosphorylation. It can also be...
375.00 € *
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HCA2 (GP-IHC-grade), Hydroxycarboxylic Acid Receptor 2 Antibody, Guinea Pig
HCA2 (GP-IHC-grade), Hydroxycarboxylic Acid...
The non-phospho HCA2 receptor antibody is directed against the distal end of the carboxyl-terminal tail human HCA2 receptor. It can be used to detect total HCA2 receptors in Western blots independent of phosphorylation. It can also be...
375.00 € *
Details
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HCA2 (GP-non-phospho) Hydroxycarboxylic Acid Receptor 2 Antibody, Guinea Pig
HCA2 (GP-non-phospho) Hydroxycarboxylic Acid...
The non-phospho HCA2 receptor antibody is directed against the distal end of the carboxyl-terminal tail human HCA2 receptor. It can be used to detect total HCA2 receptors in Western blots independent of phosphorylation. It can also be...
375.00 € *
Details
NEW
HCA2 (non-phospho) Hydroxycarboxylic Acid Receptor 2 Antibody
HCA2 (non-phospho) Hydroxycarboxylic Acid...
The non-phospho HCA2 receptor antibody is directed against the distal end of the carboxyl-terminal tail human HCA2 receptor. It can be used to detect total HCA2 receptors in Western blots independent of phosphorylation. It can also be...
375.00 € *
Details
NEW
SMO (IHC-grade), Smoothened Receptor Antibody
SMO (IHC-grade), Smoothened Receptor Antibody
The non-phospho SMO receptor antibody is directed against the distal end of the carboxyl-terminal tail human SMO receptor. It can be used to detect total SMO receptors in Western blots independent of phosphorylation. It can also be used...
375.00 € *
Details
NEW
SMO (GP-IHC-grade), Smoothened Receptor Antibody, Guinea Pig
SMO (GP-IHC-grade), Smoothened Receptor...
The non-phospho SMO receptor antibody is directed against the distal end of the carboxyl-terminal tail human SMO receptor. It can be used to detect total SMO receptors in Western blots independent of phosphorylation. It can also be used...
375.00 € *
Details
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pS298/pS300-M4 (IHC-grade phospho-M4 Muscarinic Acetylcholine Receptor Antibody)
pS298/pS300-M4 (IHC-grade phospho-M4 Muscarinic...
Serine298/Serine300 is a major phosphorylation site of the M4 Muscarinic Acetylcholine Receptor. The pS298/pS300-M4 antibody detects phosphorylation in response to high-efficacy agonists but not after PKC activation. S298/S300...
375.00 € *
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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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