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Activation and Inactivation of G Proteins

Activation and Inactivation of G Proteins

Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high affinity and are together...

Transducer Mechanism: G Protein–Coupled Receptors

Transducer Mechanism: G Protein–Coupled Receptors

G Protein–Coupled Receptors (GPCRs) are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to various stimuli. GPCRs regulate critical physiological pathways and are excellent drug targets for treating diseases such as diabetes, cancer, obesity, depression, or Alzheimer's. Nearly 35% of approved drugs implement their therapeutic effects by selectively interacting with specific GPCRs.
GPCRs are also called heptahelical, 7TM, or...

G-protein Coupled Receptors

G-protein Coupled Receptors

G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.

G-protein Coupled Receptors

G-protein Coupled Receptors

G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.

G Protein-coupled Receptors

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G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...

G Protein-coupled Receptors

G Protein-coupled Receptors

G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...

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Updated: Jun 7, 2026

Identification and Classification of Position-specific GABAA Receptor Subunit Missense Variants for Their Role In Hippocampal Pyramidal Neurons

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Conserved residues in the Gα interface show subtype specificity in Gβγ coupling.

Wenyuan Wei¹, H Dalton Taylor², Ning Ma³

¹Department of Computational & Quantitative Medicine, Beckman Research Institute of the City of Hope, Duarte, California, USA; Irell and Manella Graduate School of Biological Science, Beckman Research Institute of the City of Hope, Duarte, California, USA.

The Journal of Biological Chemistry

|June 5, 2026

Summary

Conserved residues in Gα subtypes do not guarantee similar functions in G protein signaling. Their specific roles in Gβγ coupling depend on local environments and paralog-specific interactions, impacting drug design.

Keywords:

Bayesian Network Model bioluminescent resonance energy transfer heterotrimeric G proteins molecular dynamics simulations site-directed mutagenesis

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Stability and Structure of Bat Major Histocompatibility Complex Class I with Heterologous β2-Microglobulin

Stability and Structure of Bat Major Histocompatibility Complex Class I with Heterologous β₂-Microglobulin

Published on: March 10, 2021

Area of Science:

Molecular Biology
Biochemistry
Computational Biology

Background:

The structural basis of G protein-coupled receptor (GPCR) interactions is known, but how distinct Gα subtypes selectively interact with Gβγ subunits is unclear.
Conserved residues in Gα subtypes are often assumed to have equivalent functions, but this may not be true for Gα:Gβγ interface selectivity.

Purpose of the Study:

To investigate the functional roles of conserved residues in Gα subtypes during Gβγ coupling.
To determine if conserved residues exhibit differential contributions to Gβγ coupling selectivity between Gα_i/o and Gα_q/11 subfamilies.

Main Methods:

Employed molecular dynamics (MD) simulations to model protein interactions.
Utilized Bayesian Network Models (BNM) for interpretable machine learning analysis.
Applied bioluminescence resonance energy transfer (BRET) assays to measure protein-protein proximity.

Main Results:

Identified conserved residue "hotspots" on Gα_i1 and Gα_q that differentially affect Gβγ coupling.
Demonstrated that conserved residues can have divergent functional outcomes on Gβγ coupling, challenging the assumption of functional equivalence.
Showed that local microenvironment and paralog-specific allosteric coupling influence the function of conserved interface residues.

Conclusions:

Conservation of residues does not equate to functional equivalence in Gα:Gβγ interactions.
Subtype-specific mechanisms of Gβγ coupling are shaped by local contexts and allosteric effects.
The developed framework offers a systematic approach for studying homologous protein families and has implications for drug discovery and disease variant annotation.