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IP3/DAG Signaling Pathway01:11

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Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
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Assembly of Signaling Complexes01:30

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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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Phosphoinositides and PIPs01:42

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Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
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Amplifying Signals via Enzymatic Cascade01:22

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When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...
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GPCR Desensitization01:12

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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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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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Video Experimental Relacionado

Updated: Aug 22, 2025

Single-molecule Super-resolution Imaging of Phosphatidylinositol 4,5-bisphosphate in the Plasma Membrane with Novel Fluorescent Probes
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Los fosfoinosítidos de membrana regulan el conjunto y la dinámica del complejo GPCR-β-arrestina

John Janetzko1, Ryoji Kise2, Benjamin Barsi-Rhyne3

  • 1Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA 94305, USA.

Cell
|November 11, 2022
PubMed
Resumen

Los fosfoinosítidos de membrana (PIP) controlan cómo las arrestinas se unen a los receptores acoplados a proteínas G (GPCR). Los PIP estabilizan los complejos GPCR-arrestina, influyendo en la señalización y el reciclaje de los receptores.

Palabras clave:
GPCR y sus derivadosLa detenciónDinámica de conformaciónLa endocitosisEspectroscopia de fluorescenciaFósfonosítidosseñalización

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Área de la Ciencia:

  • Biología celular
  • La bioquímica
  • Farmacología molecular

Sus antecedentes:

  • La unión de Arrestin a los receptores acoplados a proteínas G fosforiladas (GPCR) es esencial para la modulación de la señal.
  • Dinámica de internalización de GPCR con las vías de señalización y reciclaje de impacto de las β-arrestinas.
  • Los fosfoinosítidos de membrana (PIP) están implicados en la regulación de las interacciones GPCR-β-arrestina.

Objetivo del estudio:

  • Investigar el papel de los fosfoinosítidos de membrana (PIP) en el reclutamiento de la β-arrestina y la dinámica del complejo GPCR-β-arrestina.
  • Determinar cómo los PIP influyen en la interacción entre los GPCR y las β-arrestinas.
  • Comprender los mecanismos que rigen la señalización y el reciclaje de GPCR basados en las interacciones PIP.

Principales métodos:

  • Se utilizaron ensayos basados en células para estudiar las interacciones GPCR-β-arrestina.
  • Se emplean ensayos biofísicos in vitro para analizar dinámicas complejas.
  • Se ha investigado la influencia de los fosfoinosítidos de membrana en el reclutamiento de arrestin.

Principales resultados:

  • Los GPCR se clasificaron en dos grupos en función de su requerimiento de unión PIP para el reclutamiento de β-arrestina.
  • Se encontró que las PIP de membrana plasmática potenciaban las conformaciones activas de β-arrestina y estabilizaban los complejos GPCR-β-arrestina.
  • Los PIP actúan como moduladores alostéricos, permitiendo la diversidad conformacional en los complejos GPCR-β-arrestina.

Conclusiones:

  • Los PIP de membrana juegan un papel crítico en la regulación de la dinámica de las interacciones GPCR-β-arrestina.
  • Existen vías dependientes de PIP e independientes para el reclutamiento de la β-arrestina, que afectan el destino de la GPCR.
  • Los PIP proporcionan un mecanismo para la liberación de β-arrestina y el posterior reciclaje de GPCR en casos específicos.