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Videos de Conceptos Relacionados

Phosphorylation01:02

Phosphorylation

The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
Phosphorylation01:02

Phosphorylation

The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
Protein Kinases and Phosphatases02:54

Protein Kinases and Phosphatases

Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
Protein Kinases and Phosphatases02:54

Protein Kinases and Phosphatases

Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
Amplifying Signals via Enzymatic Cascade01:22

Amplifying Signals via Enzymatic Cascade

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 the...
Transducer Mechanism: Enzyme-Linked Receptors01:27

Transducer Mechanism: Enzyme-Linked Receptors

Enzyme-linked receptors are cell-surface receptors acting as an enzyme or associating with an enzyme intracellularly. They make excellent drug targets. Drugs can bind to the extracellular ligand-binding domain or directly affect their enzymatic domain and alter their activity.
Major types that are helpful drug targets include:

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Identification of Post-translational Modifications of Plant Protein Complexes
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Identification of Post-translational Modifications of Plant Protein Complexes

Published on: February 22, 2014

Las fosfatasas serina/treonina: mecanismo a través de la estructura.

Yigong Shi1

  • 1Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China. shi-lab@tsinghua.edu.cn

Cell
|November 3, 2009
PubMed
Resumen

Las proteínas fosfatasas son cruciales para la señalización celular. Esta revisión explora los mecanismos de las principales clases de proteínas serina/treonina fosfatasa, centrándose en la regulación y función de la proteína fosfatasa 2A (PP2A).

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Biología Molecular Biología Molecular
  • Biología Estructural Biología estructural.

Sus antecedentes:

  • La fosforilación de proteínas es un mecanismo regulador clave en los procesos celulares.
  • Las proteína serina/treonina fosfatasas (PSP) contrarrestan la actividad de la quinasa mediante la eliminación de los grupos fosfato.
  • Un número limitado de PSP desfosforilan numerosos sustratos, lo que requiere mecanismos de regulación específicos.

Objetivo del estudio:

  • Revisar las bases bioquímicas y estructurales de la función de la proteína serina/treonina fosfatasa (PSP).
  • Aclarar los mecanismos de especificidad y regulación del sustrato en las principales clases de PSP.
  • Para resaltar la importancia de la proteína fosfatasa 2A (PP2A) dentro de las PSP.

Principales métodos:

  • Análisis bioquímicos para estudiar la actividad y las interacciones de las enzimas.
  • Técnicas de biología estructural (por ejemplo, cristalografía de rayos X, cryo-EM) para determinar las estructuras de las proteínas.
  • Análisis bioinformático para comparar diferentes clases de fosfatasas.

Principales resultados:

  • Los PSP logran la especificidad a través de diversas estrategias, incluidas las interacciones de subunidades catalíticas y regulatorias (por ejemplo, PP1, PP2A) o dominios intrínsecos (por ejemplo, PP2C, FCP / SCP).
  • Los datos estructurales y bioquímicos detallados proporcionan una visión mecanicista de la regulación de la fosfatasa.
  • PP2A ejemplifica una clase importante de PSP que confía en las subunidades regulatorias para la especificidad.

Conclusiones:

  • Comprender los mecanismos del PSP es vital para comprender las redes de señalización celular.
  • Las distintas estrategias empleadas por las clases de PSP resaltan la complejidad de la desfosforilación.
  • Una mayor investigación sobre los PSP, en particular PP2A, tiene potencial para intervenciones terapéuticas.