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Related Concept Videos

GPCR Desensitization01:12

GPCR Desensitization

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...
G-protein Coupled Receptors01:21

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 Receptors01:21

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 Receptors01:15

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...
G Protein-coupled Receptors01:15

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...
Transducer Mechanism: G Protein–Coupled Receptors01:30

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...

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Measuring G-protein-coupled Receptor Signaling via Radio-labeled GTP Binding
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GRK2: multiple roles beyond G protein-coupled receptor desensitization.

Tama Evron1, Tanya L Daigle, Marc G Caron

  • 1Department of Cell Biology, Medicine and Neurobiology, Duke University Medical Center, Durham, NC 27710, USA. tama.evron@duke.edu

Trends in Pharmacological Sciences
|January 27, 2012
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G protein-coupled receptor kinases (GRKs) regulate G protein-coupled receptors (GPCRs) through phosphorylation and protein interactions. This review highlights GRK2

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BRET-based G Protein Biosensors for Measuring G Protein-Coupled Receptor Activity in Live Cells

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Area of Science:

  • Molecular and Cellular Biology
  • Biochemistry and Pharmacology

Background:

  • G protein-coupled receptor kinases (GRKs) are crucial regulators of G protein-coupled receptors (GPCRs).
  • GRKs mediate receptor desensitization and internalization via phosphorylation.
  • GRKs also influence GPCR trafficking through phosphorylation-independent protein interactions.

Purpose of the Study:

  • To review the established and emerging roles of GRK2 in GPCR regulation.
  • To explore GRK2's impact on non-receptor substrates and cellular signaling.
  • To discuss novel functions of GRK2 in dopamine receptor and Smoothened (Smo) signaling.

Main Methods:

  • Literature review of existing research on GRK2.
  • Analysis of studies detailing GRK2's phosphorylation-dependent and independent mechanisms.
  • Synthesis of findings on GRK2's involvement in specific receptor systems.

Main Results:

  • GRK2 phosphorylates GPCRs, leading to desensitization and internalization.
  • GRK2 interacts directly with signaling molecules, affecting cellular responses.
  • GRK2 plays significant roles in dopamine receptor signaling and Smo activation/trafficking.

Conclusions:

  • GRK2 is a versatile kinase with diverse roles beyond GPCR phosphorylation.
  • GRK2's non-receptor functions and involvement in novel pathways are critical.
  • Understanding GRK2's multifaceted actions is key to deciphering complex cellular signaling.