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Related Concept Videos

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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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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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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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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GPCR Desensitization01:12

GPCR Desensitization

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G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
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Assembly of Signaling Complexes01:30

Assembly of Signaling Complexes

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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
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Updated: Oct 1, 2025

Genetically-encoded Molecular Probes to Study G Protein-coupled Receptors
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Genetically-encoded Molecular Probes to Study G Protein-coupled Receptors

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QR code model: a new possibility for GPCR phosphorylation recognition.

Hao Chen1, Suli Zhang1,2, Xi Zhang1

  • 1Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, 10 Xitoutiao, You An Men Street, Beijing, 100069, People's Republic of China.

Cell Communication and Signaling : CCS
|March 3, 2022
PubMed
Summary
This summary is machine-generated.

Arrestin binding to phosphorylated G protein-coupled receptors (GPCRs) is crucial for cell signaling. A new "QR code" model integrates multiple factors to explain this complex recognition mechanism.

Keywords:
Bar code modelFlute modelGPCR phosphorylation recognitionGPCR signalingQR code model

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Oligopeptide Competition Assay for Phosphorylation Site Determination
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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Pharmacology

Background:

  • G protein-coupled receptors (GPCRs) are the largest membrane protein family, mediating cellular responses to extracellular signals.
  • Arrestins play a key role in GPCR signaling, facilitating receptor desensitization, endocytosis, and signal transduction.
  • The precise mechanism of arrestin recognition of phosphorylated GPCRs remains incompletely understood.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying arrestin recognition of phosphorylated GPCRs.
  • To propose a comprehensive model integrating various factors involved in GPCR phosphorylation recognition.

Main Methods:

  • The study integrates existing knowledge on GPCR phosphorylation, arrestin structure, and signaling pathways.
  • A conceptual framework, the "QR code" model, is developed based on current literature.

Main Results:

  • Existing models like the "bar code" and "flute" models provide partial insights into GPCR phosphorylation recognition.
  • The proposed "QR code" model suggests a multi-factorial process involving ligands, GPCRs, kinases, arrestins, and phosphorylation sites.
  • This integrated model highlights the combinatorial nature of GPCR phosphorylation recognition.

Conclusions:

  • GPCR phosphorylation recognition is a complex, multi-component process.
  • The "QR code" model offers a unified perspective on how these components collectively determine the function of phosphorylated GPCRs.
  • Further research is needed to experimentally validate the proposed "QR code" model.