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Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.
Abnormal Proliferation02:23

Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
Phase II Reactions: Acetylation Reactions01:24

Phase II Reactions: Acetylation Reactions

Acetylation, a phase II biotransformation reaction, introduces an acetyl group to drugs or their metabolites. Acetyltransferase enzymes facilitate this reaction, which resembles α-amino acid conjugation due to the addition of a functional group to the drug molecule.
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DNA Damage Can Stall the Cell Cycle02:36

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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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DNA Damage can Stall the Cell Cycle

In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
Histone Modification02:32

Histone Modification

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
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Purification of Ubiquitinated p53 Proteins from Mammalian Cells
10:55

Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Published on: March 21, 2022

La acetilación es indispensable para la activación de p53.

Yi Tang1, Wenhui Zhao, Yue Chen

  • 1Institute for Cancer Genetics, College of Physicians & Surgeons, Columbia University, New York, NY 10032, USA.

Cell
|May 20, 2008
PubMed
Resumen

La acetilación del supresor tumoral p53 es esencial para su activación, permitiendo la respuesta al estrés celular. Esta modificación desestabiliza la interacción p53-Mdm2, promoviendo la detención del crecimiento y la apoptosis.

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Área de la Ciencia:

  • Biología molecular La biología molecular.
  • La respuesta al estrés celular es la respuesta al estrés celular.
  • La supresión tumoral es la supresión del tumor.

Sus antecedentes:

  • El supresor tumoral p53 es crucial para las respuestas celulares al estrés genotóxico.
  • La activación de p53 requiere la interrupción de su interacción con el inhibidor Mdm2.
  • El papel preciso de las modificaciones posttraducionales de p53, como la fosforilación y la acetilación, en su activación sigue siendo objeto de debate.

Objetivo del estudio:

  • Para identificar todos los principales sitios de acetilación de p53.
  • Para determinar si la acetilación de p53 es esencial para su activación y función.
  • Para dilucidar el mecanismo por el cual la acetilación de p53 influye en la interacción p53-Mdm2.

Principales métodos:

  • Identificación de los sitios de acetilación de p53.
  • Análisis de la detención del crecimiento dependiente de p53 y la apoptosis en presencia o ausencia de acetilación.
  • Investigación del reclutamiento de Mdm2 a promotores receptivos a p53.

Principales resultados:

  • La pérdida de la acetilación de p53 abolió por completo la detención del crecimiento dependiente de p53 y la apoptosis.
  • La acetilación de p53 anula la represión mediada por Mdm2 al prevenir el reclutamiento de Mdm2 a los promotores objetivo.
  • La activación de p53 a través de la acetilación ocurre independientemente de su estado de fosforilación.

Conclusiones:

  • La acetilación de p53 es un evento indispensable para la respuesta al estrés mediada por p53.
  • La acetilación desestabiliza la interacción p53-Mdm2, lo que lleva a la activación de p53.
  • Este estudio aclara el papel crítico de la acetilación de p53 en las vías de respuesta al estrés celular.