Video Experimental Relacionado
Updated: Jul 29, 2025

09:25
Quantifying Subcellular Ubiquitin-proteasome Activity in the Rodent Brain
Published on: May 21, 2019
6.8K
Una abundancia de partículas de proteasomas reguladoras libres regula las sinapsis neuronales
Chao Sun1, Kristina Desch1, Belquis Nassim-Assir1
1Max Planck Institute for Brain Research, 60438 Frankfurt am Main, Germany.
Resumen
El proteasoma
Área de la Ciencia:
- La neurociencia
- Biología celular
- Biología molecular
Sus antecedentes:
- El proteosoma es crucial para la degradación de las proteínas y la función neuronal.
- Las funciones específicas de sus subcomplejos en las sinapsis no se comprenden completamente.
Objetivo del estudio:
- Investigar la distribución y la función de los subcomplejos del proteasoma en las neuronas.
- Explorar las funciones no canónicas de la partícula reguladora del proteosoma 19S.
Principales métodos:
- Microscopía de súper resolución para visualizar la distribución del proteasoma.
- Ensayos bioquímicos para identificar las interacciones de las proteínas.
- Electrofisiología para evaluar la función sináptica.
Principales resultados:
- Las partículas libres del proteosoma 19S son abundantes cerca de las sinapsis.
- Las partículas 19S desubiquitan los enlaces de Lys63-ubiquitina, interactuando con las moléculas sinápticas.
- La inhibición de la actividad de la 19S deubiquitylase altera la transmisión sináptica y el tráfico de los receptores AMPA.
Conclusiones:
- La partícula reguladora del proteosoma 19S tiene una función de "luz de luna" en las sinapsis.
- Esta función es independiente de la actividad de degradación del proteasoma.
- Las partículas 19S regulan la plasticidad sináptica y la dinámica de los receptores AMPA.
Más Videos Relacionados
Videos de Conceptos Relacionados
The Proteasome
915
Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
915
Regulated Protein Degradation
7.4K
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...
7.4K
Regulation of Nuclear Protein Sorting
2.4K
Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
2.4K
Neural Regulation
39.6K
Digestion begins with a cephalic phase that prepares the digestive system to receive food. When our brain processes visual or olfactory information about food, it triggers impulses in the cranial nerves innervating the salivary glands and stomach to prepare for food.
39.6K
Regulation of Expression at Multiple Steps
955
The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
955
Covalently Linked Protein Regulators
6.9K
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....
6.9K

