Video Experimental Relacionado
Updated: Jan 20, 2026
07:40
Protection of H9c2 Myocardial Cells from Oxidative Stress by Crocetin via PINK1/Parkin Pathway-Mediated Mitophagy
Published on: May 26, 2023
1.6K
La ubiquitina es fosforilada por PINK1 para activar el parkin
Fumika Koyano1, Kei Okatsu1, Hidetaka Kosako2
11] Laboratory of Protein Metabolism, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo 156-8506, Japan [2] Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan.
Nature
|May 3, 2014
Resumen
La quinasa 1 inducida por PTEN (PINK1) directamente fosforila la ubiquitina, activando la E3 ligasa parkin. por ejemplo. Este descubrimiento revela la ubiquitina fosforilada como un activador clave en el control de la calidad mitocondrial, impactando la investigación de la enfermedad de Parkinson.
Área de la Ciencia:
- Biología celular Biología celular.
- La neurociencia es la neurociencia.
- La bioquímica es la bioquímica.
Sus antecedentes:
- El parkinsonismo hereditario está relacionado con los genes PINK1 y PARKIN (PARK2).
- La PINK1 quinasa activa la parkin E3 ligasa para la reparación de las mitocondrias.
- Estudios previos mostraron que los fosforilatos de PINK1 actúan, pero los mecanismos de activación no estaban claros.
Objetivo del estudio:
- Para dilucidar el sustrato directo de PINK1 en la activación de parkin.
- Para investigar el papel de la fosforilación de la ubiquitina en la actividad de la parkin E3 ligasa.
- Para entender el mecanismo de control de calidad mitocondrial por PINK1 y parkin.
Principales métodos:
- Ensayos in vitro y celulares para detectar la fosforilación de la ubiquitina mediada por PINK1.
- Análisis de la ubiquitina fosfomimética y las mutaciones de parkin.
- Ensayos bioquímicos para medir la actividad de la parkin E3 ligasa.
Principales resultados:
- PINK1 directamente fosforila la ubiquitina en el Ser65.
- La ubiquitina fosforilada evita la necesidad de PINK1 en la activación del parkin fosfomimético.
- La ubiquitina fosfomimética mejora alostericamente la actividad E3 de parkin al promover la descarga de ubiquitina.
Conclusiones:
- La ubiquitina es un sustrato directo de PINK1, y su fosforilación es crucial para la activación de parkin.
- La ubiquitina fosforilada actúa como un potente activador de la actividad de la parkin E3 ligasa.
- Este hallazgo proporciona una nueva comprensión mecanicista de la vía PINK1-parkin en la enfermedad de Parkinson.
Videos de Conceptos Relacionados
01:02Phosphorylation
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...
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
02:58Regulated Protein Degradation
8.8K
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
8.8K
02:04Covalently Linked Protein Regulators
8.7K
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....
These groups modify specific amino acids in a protein....
8.7K
02:04Co-activators and Co-repressors
8.4K
Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
8.4K
02:26tRNA Activation
22.6K
Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
22.6K
01:26Activation Energy
86.4K
Activation energy is the minimum amount of energy necessary for a chemical reaction to move forward. The higher the activation energy, the slower the rate of the reaction. However, adding heat to the reaction will increase the rate, since it causes molecules to move faster and increase the likelihood that molecules will collide. The collision and breaking of bonds represents the uphill phase of a reaction and generates the transition state. The transition state is an unstable high-energy state...
86.4K