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The Proteasome01:13

The Proteasome

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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.
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The Proteasome Structure01:17

The Proteasome Structure

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The ubiquitin-proteasome pathway is a well-known mechanism utilized by eukaryotic cells to remove cytoplasmic proteins that are misfolded, damaged, or no longer needed. In this pathway, the protein that needs to be eliminated undergoes a process called ubiquitination, where a chain of ubiquitin molecules is attached to the 48th lysine residue of the target protein. This ubiquitin modification helps the proteasome distinguish between a target protein and a healthy protein.
The proteasome is an...
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Regulated Protein Degradation02:58

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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.
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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.
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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Quantifying Subcellular Ubiquitin-proteasome Activity in the Rodent Brain
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El capuchón proteasómico regula las sinapsis

Fulya Türker1, Seth S Margolis1,2

  • 1Department of Biological Chemistry, The Johns Hopkins University School of Medicine, Baltimore, MD, USA.

Science (New York, N.Y.)
|May 25, 2023
PubMed
Resumen
Este resumen es generado por máquina.

Las partículas libres del proteasoma 19S

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Área de la Ciencia:

  • La neurociencia
  • Biología molecular
  • Biología celular

Sus antecedentes:

  • La transmisión sináptica es crucial para la comunicación neuronal.
  • El sistema ubiquitina-proteasoma regula la rotación de las proteínas.
  • La partícula de la tapa del proteosoma 19S juega un papel en la degradación de las proteínas.

Objetivo del estudio:

  • Investigar el papel de la partícula de la tapa del proteasoma 19S libre en la transmisión sináptica.
  • Para explorar la actividad de desubiquitación de la partícula de la tapa del proteosoma 19S libre en las sinapsis.

Principales métodos:

  • Ensayos bioquímicos para medir la actividad de desubiquitación.
  • Registros electrofisiológicos para evaluar la transmisión sináptica.
  • Inmunofluorescencia y manchas occidentales para detectar la localización y los niveles de proteínas.

Principales resultados:

  • Las partículas libres del proteosoma 19S muestran actividad de desubiquitación en las sinapsis.
  • Esta actividad de desubiquitación modula la transmisión sináptica.
  • Se identificaron objetivos específicos de desubiquitación en la sinapsis.

Conclusiones:

  • La deubiquitilación mediada por partículas de la tapa del proteasoma 19S libre es un nuevo regulador de la función sináptica.
  • Dirigirse a esta vía puede ofrecer estrategias terapéuticas para trastornos neurológicos.