Specificity of metabotropic glutamate receptor 2 coupling to G proteins.

Title

Specificity of metabotropic glutamate receptor 2 coupling to G proteins.

Creator

Kammermeier Paul J; Davis Margaret I; Ikeda Stephen R

Publisher

Molecular pharmacology

Date

2003
2003-01

Description

Metabotropic glutamate receptor 2 (mGluR2) is a class 3 G protein-coupled receptor and an important mediator of synaptic activity in the central nervous system. Previous work demonstrated that mGluR2 couples to pertussis toxin (PTX)-sensitive G proteins. However, the specificity of mGluR2 coupling to individual members of the G(i/o) family is not known. Using heterologously expressed mGluR2 in rat sympathetic neurons from the superior cervical ganglion (SCG), the mGluR2/G protein coupling profile was characterized by reconstituting coupling in PTX-treated cells expressing PTX-insensitive mutant Galpha proteins and Gbetagamma. By employing this method, it was demonstrated that mGluR2 coupled strongly with Galphaob, Galphai1, Galphai2, and Galphai3, although coupling to Galphaoa was less efficient. In addition, mGluR2 did not seem to couple to the most divergent member of the G(i/o) family, Galphaz, although Galphaz coupled strongly to the endogenous alpha2 adrenergic receptor. To determine which Galpha proteins may be natively expressed in SCG neurons, the presence of mRNA for various Galpha proteins was tested using reverse transcription-polymerase chain reaction. Strong bands were detected for all members of the G(i/o) family (Galphao, Galphai1, Galphai2, Galphai3, Galphaz) as well as for Galpha11 and Galphas. A weak signal was detected for Galphaq and no Galpha15 mRNA was detected.

Subject

Amino Acid; Amino Acid Sequence; Animals; Calcium/metabolism; Electrophysiology; Gi-Go/metabolism; GTP-Binding Protein alpha Subunits; GTP-Binding Proteins/*metabolism; Metabotropic Glutamate/*metabolism; Molecular Sequence Data; Neurons/*drug effects/metabolism; Pertussis Toxin/*pharmacology; Rats; Receptors; Sequence Homology; Superior Cervical Ganglion/cytology; Wistar

Rights

Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).

Pages

183–191

Issue

1

Volume

63

Citation

Kammermeier Paul J; Davis Margaret I; Ikeda Stephen R, “Specificity of metabotropic glutamate receptor 2 coupling to G proteins.,” NEOMED Bibliography Database, accessed September 19, 2021, https://neomed.omeka.net/items/show/4530.

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