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Phosphorylation01:02

Phosphorylation

53.7K
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...
53.7K
Histone Modification02:32

Histone Modification

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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
16.0K
Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer...
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Anatomy of Chloroplasts01:07

Anatomy of Chloroplasts

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Green algae and plants, including green stems and unripe fruit, harbor chloroplasts—the vital organelles where photosynthesis takes place. In plants, the highest density of chloroplasts is found in the mesophyll cells of leaves.
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Eukaryotic RNA Polymerases00:58

Eukaryotic RNA Polymerases

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RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
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Protein Kinases and Phosphatases02:54

Protein Kinases and Phosphatases

15.0K
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...
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Video Experimental Relacionado

Updated: Jan 22, 2026

Synthesis of Near-Infrared Emitting Gold Nanoclusters for Biological Applications
09:11

Synthesis of Near-Infrared Emitting Gold Nanoclusters for Biological Applications

Published on: March 22, 2020

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Simulación de la fosforilación de mono- y multiproteínas dentro de nanoclústeres

Olivier Destaing1, Bertrand Fourcade2

  • 1Institute for Advanced Biosciences, Université Grenoble Alpes, Inserm U1209, CNRS UMR 5309, 38000 Grenoble, France.

Physical review. E
|January 21, 2026
PubMed
Resumen
Este resumen es generado por máquina.

Los nanoclústeres de proteínas se forman a través de modificaciones postraduccionales como la fosforilación. Este estudio simula cómo los patrones de fosforilación, influenciados por factores biofísicos, crean respuestas celulares similares a un interruptor, lo que impacta la función de las proteínas.

Palabras clave:
Fosforilación de proteínasNanoclústeresDinámica de señalizaciónRespuesta celularFosfatasas

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Área de la Ciencia:

  • Bioquímica
  • Biología Celular
  • Biofísica

Sus antecedentes:

  • El nanoclustering de proteínas es clave para la activación celular y la formación de estructuras.
  • Las modificaciones postraduccionales, incluida la fosforilación y desfosforilación, regulan la formación de nanoclústeres.
  • Los modelos existentes a menudo ven la fosforilación como binaria, sin tener en cuenta patrones complejos.

Objetivo del estudio:

  • Simular teóricamente la dinámica de la fosforilación de proteínas dentro de nanoclústeres.
  • Explorar la interacción entre la mono- y la multifosforilación.
  • Comprender cómo las fosfatasas convierten las señales de fosforilación graduadas en respuestas similares a un interruptor.

Principales métodos:

  • Simulación teórica de la fosforilación de proteínas en múltiples residuos.
  • Análisis de parámetros biofísicos como la difusión y el tiempo de permanencia.
  • Modelado del papel de las fosfatasas en la transducción de señales.

Principales resultados:

  • La fosforilación de proteínas puede ser mono- o multifosforilada dependiendo de parámetros biofísicos.
  • La multifosforilación exhibe efectos cooperativos dentro de las redes.
  • Las fosfatasas juegan un papel crítico en la generación de respuestas celulares similares a un interruptor a partir de señales de fosforilación graduadas.

Conclusiones:

  • La fosforilación es un proceso dinámico con estados graduados, no solo binarios.
  • Comprender estas dinámicas de fosforilación es crucial para comprender la activación y función celular.
  • La interacción de la fosforilación y la desfosforilación gobierna la señalización celular.