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Amplifying Signals via Enzymatic Cascade01:22

Amplifying Signals via Enzymatic Cascade

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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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Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

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Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
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Intracellular Signaling Cascades01:24

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Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...
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Amplifying Signals via Second Messengers01:15

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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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Signal Transduction: Overview01:26

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Cells respond to many types of information, often through receptor proteins positioned on the membrane. They respond to chemical signals, such as hormones, neurotransmitters, and other signaling molecules, initiating a series of molecular reactions to produce an appropriate response. This is called signal transduction. Cells also coordinate different responses elicited by the same signaling molecule via mediators, allowing molecular cross-talk.
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Detection of Signaling Effector-Complexes Downstream of BMP4 Using in situ PLA, a Proximity Ligation Assay
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Descifrar la señalización de receptores de aguas abajo

Marta Filizola1, Jonathan A Javitch2,3,4

  • 1Department of Pharmacological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA.

Science (New York, N.Y.)
|December 21, 2023
PubMed
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La biología estructural integradora es crucial para avanzar en el descubrimiento de fármacos. Este enfoque combina múltiples técnicas para proporcionar conocimientos moleculares integrales para el desarrollo de nuevos medicamentos.

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Área de la Ciencia:

  • Biología estructural
  • Descubrimiento de drogas
  • Biología molecular

Sus antecedentes:

  • El descubrimiento de drogas es un proceso complejo.
  • Los métodos tradicionales tienen sus limitaciones.
  • Necesidad de técnicas avanzadas.

Objetivo del estudio:

  • Para resaltar la importancia de la biología estructural integradora.
  • Para discutir su papel en el descubrimiento de medicamentos modernos.
  • Para mostrar los avances en el campo.

Principales métodos:

  • Integración de varias técnicas de biología estructural.
  • Análisis de datos multimodales.
  • Modelado y simulación computacional.

Principales resultados:

  • Comprensión mejorada de los mecanismos moleculares.
  • Mejora de la predicción de la eficacia y toxicidad del fármaco.
  • Identificación acelerada de las drogas candidatas.

Conclusiones:

  • La biología estructural integral es esencial para el descubrimiento eficiente de fármacos.
  • Este enfoque ofrece una visión más profunda de los sistemas biológicos.
  • Abre el camino para nuevas intervenciones terapéuticas.