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Related Concept Videos

Activation and Inactivation of G Proteins01:22

Activation and Inactivation of G Proteins

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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...
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G-protein Coupled Receptors01:21

G-protein Coupled Receptors

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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.
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Transducer Mechanism: G Protein–Coupled Receptors01:30

Transducer Mechanism: G Protein–Coupled Receptors

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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,...
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G Protein-coupled Receptors01:15

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...
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GPCRs Regulate Adenylyl Cylase Activity01:09

GPCRs Regulate Adenylyl Cylase Activity

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Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of...
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Amplifying Signals via Second Messengers01:15

Amplifying Signals via Second Messengers

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Many receptor binding ligands are hydrophilic; they do not cross the cell membrane but bind to cell-surface receptors. Thus, their message must be relayed by second messengers present in the cell cytoplasm. There are several second messenger pathways, each with its own way of relaying information. For example, the G protein-coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol pathway is active when the receptor induces...
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Related Experiment Video

Updated: Feb 22, 2026

Measuring G-protein-coupled Receptor Signaling via Radio-labeled GTP Binding
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Measuring G-protein-coupled Receptor Signaling via Radio-labeled GTP Binding

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Structural Basis for G Protein-Coupled Receptor Activation.

Aashish Manglik1, Andrew C Kruse2

  • 1Department of Pharmaceutical Chemistry, University of California, San Francisco , San Francisco, California 94158, United States.

Biochemistry
|October 3, 2017
PubMed
Summary
This summary is machine-generated.

G protein-coupled receptors (GPCRs) are key drug targets. Structural studies reveal how diverse ligands activate these receptors through conserved conformational changes, enabling shared signaling pathways.

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Characterization of G Protein-coupled Receptors by a Fluorescence-based Calcium Mobilization Assay
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Area of Science:

  • Biochemistry and Structural Biology
  • Pharmacology
  • Molecular Cell Biology

Background:

  • G protein-coupled receptors (GPCRs) are the largest class of drug targets, crucial for human physiology.
  • GPCRs share a common signaling mechanism involving conformational changes upon extracellular stimulus.
  • Recent advances in structural biology offer detailed insights into GPCR activation.

Purpose of the Study:

  • To review the structural basis of family A GPCR activation.
  • To focus on GPCRs with available structures in both active and inactive states.
  • To elucidate how diverse ligands stabilize conserved conformational changes.

Main Methods:

  • Review of crystallographic data.
  • Analysis of biophysical data.
  • Comparison of active and inactive GPCR structures.

Main Results:

  • Chemically diverse ligands stabilize conserved intracellular conformational changes in GPCRs.
  • This mechanism allows various extracellular stimuli to use shared downstream signaling molecules.
  • Structural data provides unprecedented detail on ligand-induced GPCR activation.

Conclusions:

  • Understanding the structural basis of GPCR activation is critical for drug development.
  • Conserved conformational changes are key to GPCR signaling diversity.
  • Future technologies are needed to address remaining questions in GPCR activation and signaling.