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Mu opioid receptor activation enhances regulator of G protein signaling 4 association with the mu opioid receptor/G protein complex in a GTP‐dependent manner

The interaction of Regulator of G protein Signaling 4 (RGS4) with the rat mu opioid receptor (MOR)/G protein complex was investigated. Solubilized MOR from rat brain membranes was immunoprecipitated in the presence of RGS4 with antibodies against the N‐terminus of MOR (anti‐MOR(10–70)). Activation o...

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Autores principales: Santhappan, Rema, Crowder, Alicia Tamara, Gouty, Shawn, Cox, Brian M., Côté, Thomas E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5034817/
https://www.ncbi.nlm.nih.gov/pubmed/26119705
http://dx.doi.org/10.1111/jnc.13222
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author Santhappan, Rema
Crowder, Alicia Tamara
Gouty, Shawn
Cox, Brian M.
Côté, Thomas E.
author_facet Santhappan, Rema
Crowder, Alicia Tamara
Gouty, Shawn
Cox, Brian M.
Côté, Thomas E.
author_sort Santhappan, Rema
collection PubMed
description The interaction of Regulator of G protein Signaling 4 (RGS4) with the rat mu opioid receptor (MOR)/G protein complex was investigated. Solubilized MOR from rat brain membranes was immunoprecipitated in the presence of RGS4 with antibodies against the N‐terminus of MOR (anti‐MOR(10–70)). Activation of MOR with [D‐Ala(2), N‐Me‐Phe(4), Gly(5)‐ol] enkephalin (DAMGO) during immunoprecipitation caused a 150% increase in Goα and a 50% increase in RGS4 in the pellet. When 10 μM GTP was included with DAMGO, there was an additional 72% increase in RGS4 co‐immunoprecipitating with MOR (p = 0.003). Guanosine 5′‐O‐(3‐thiotriphosphate) (GTPγS) increased the amount of co‐precipitating RGS4 by 93% (compared to DAMGO alone, p = 0.008), and the inclusion of GTPγS caused the ratio of MOR to RGS4 to be 1 : 1 (31 fmoles : 28 fmoles, respectively). GTPγS also increased the association of endogenous RGS4 with MOR. In His(6)RGS4/Ni(2+)‐NTA agarose pull down experiments, 0.3 μM GTPγS tripled the binding of Goα to His(6)RGS4, whereas the addition of 100 μM GDP blocked this effect. Importantly, activation of solubilized MOR with DAMGO in the presence of 100 μM GDP and 0.3 μM GTPγS increased Goα binding to His(6)RGS4/Ni(2+)‐NTA agarose (p = 0.001). [Image: see text]Regulators of G protein Signaling (RGS) shorten the time that G proteins are active. Activation of the mu opioid receptor (MOR) causes GTP to bind to and to activate Go (αoβγ). RGS4 then binds to the activated αo‐GTP/MOR complex and accelerates the intrinsic GTPase of αo. After αo dissociates from MOR, RGS4 remains bound to the C‐terminal region of MOR.
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spelling pubmed-50348172016-10-03 Mu opioid receptor activation enhances regulator of G protein signaling 4 association with the mu opioid receptor/G protein complex in a GTP‐dependent manner Santhappan, Rema Crowder, Alicia Tamara Gouty, Shawn Cox, Brian M. Côté, Thomas E. J Neurochem ORIGINAL ARTICLES The interaction of Regulator of G protein Signaling 4 (RGS4) with the rat mu opioid receptor (MOR)/G protein complex was investigated. Solubilized MOR from rat brain membranes was immunoprecipitated in the presence of RGS4 with antibodies against the N‐terminus of MOR (anti‐MOR(10–70)). Activation of MOR with [D‐Ala(2), N‐Me‐Phe(4), Gly(5)‐ol] enkephalin (DAMGO) during immunoprecipitation caused a 150% increase in Goα and a 50% increase in RGS4 in the pellet. When 10 μM GTP was included with DAMGO, there was an additional 72% increase in RGS4 co‐immunoprecipitating with MOR (p = 0.003). Guanosine 5′‐O‐(3‐thiotriphosphate) (GTPγS) increased the amount of co‐precipitating RGS4 by 93% (compared to DAMGO alone, p = 0.008), and the inclusion of GTPγS caused the ratio of MOR to RGS4 to be 1 : 1 (31 fmoles : 28 fmoles, respectively). GTPγS also increased the association of endogenous RGS4 with MOR. In His(6)RGS4/Ni(2+)‐NTA agarose pull down experiments, 0.3 μM GTPγS tripled the binding of Goα to His(6)RGS4, whereas the addition of 100 μM GDP blocked this effect. Importantly, activation of solubilized MOR with DAMGO in the presence of 100 μM GDP and 0.3 μM GTPγS increased Goα binding to His(6)RGS4/Ni(2+)‐NTA agarose (p = 0.001). [Image: see text]Regulators of G protein Signaling (RGS) shorten the time that G proteins are active. Activation of the mu opioid receptor (MOR) causes GTP to bind to and to activate Go (αoβγ). RGS4 then binds to the activated αo‐GTP/MOR complex and accelerates the intrinsic GTPase of αo. After αo dissociates from MOR, RGS4 remains bound to the C‐terminal region of MOR. John Wiley and Sons Inc. 2015-07-16 2015-10 /pmc/articles/PMC5034817/ /pubmed/26119705 http://dx.doi.org/10.1111/jnc.13222 Text en Published 2015. This article is a U.S. Government work and is in the public domain in the USA. Journal of Neurochemistry published by John Wiley & Sons Ltd on behalf of International Society for Neurochemistry This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial (http://creativecommons.org/licenses/by-nc/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
spellingShingle ORIGINAL ARTICLES
Santhappan, Rema
Crowder, Alicia Tamara
Gouty, Shawn
Cox, Brian M.
Côté, Thomas E.
Mu opioid receptor activation enhances regulator of G protein signaling 4 association with the mu opioid receptor/G protein complex in a GTP‐dependent manner
title Mu opioid receptor activation enhances regulator of G protein signaling 4 association with the mu opioid receptor/G protein complex in a GTP‐dependent manner
title_full Mu opioid receptor activation enhances regulator of G protein signaling 4 association with the mu opioid receptor/G protein complex in a GTP‐dependent manner
title_fullStr Mu opioid receptor activation enhances regulator of G protein signaling 4 association with the mu opioid receptor/G protein complex in a GTP‐dependent manner
title_full_unstemmed Mu opioid receptor activation enhances regulator of G protein signaling 4 association with the mu opioid receptor/G protein complex in a GTP‐dependent manner
title_short Mu opioid receptor activation enhances regulator of G protein signaling 4 association with the mu opioid receptor/G protein complex in a GTP‐dependent manner
title_sort mu opioid receptor activation enhances regulator of g protein signaling 4 association with the mu opioid receptor/g protein complex in a gtp‐dependent manner
topic ORIGINAL ARTICLES
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5034817/
https://www.ncbi.nlm.nih.gov/pubmed/26119705
http://dx.doi.org/10.1111/jnc.13222
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