Video Experimental Relacionado
Updated: Aug 2, 2026
07:43
Assaying Proteasomal Degradation in a Cell-free System in Plants
Published on: March 26, 2014
Regulación de la STAT1 activada por interferón gamma por la vía ubiquitina-proteasoma
1Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138, USA.
Science (New York, N.Y.)
|September 20, 1996
Resumen
La vía ubiquitina-proteosoma puede controlar los niveles activados de la proteína STAT1. Las proteínas STAT1 activadas por interferón gamma fueron estabilizadas por los inhibidores del proteasoma, lo que sugiere este mecanismo regulador.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- La señalización celular.
- Reglamento genético Reglamento genético.
Sus antecedentes:
- Los transductores de señales y los activadores de las proteínas de transcripción (STAT) son factores clave de transcripción.
- Las proteínas STAT se activan por fosforilación a través de las quinasas de Janus en respuesta a las citoquinas.
- Las proteínas STAT activadas se translocan al núcleo para regular la expresión génica, pero su regulación no está clara.
Objetivo del estudio:
- Investigar el mecanismo que controla la cantidad de proteínas STAT activadas.
- Para determinar si la vía ubiquitina-proteosoma regula los niveles activados de STAT1.
Principales métodos:
- Utilizado tratamiento con interferón gamma en células HeLa.
- Inhibidores del proteasoma empleados para evaluar la estabilidad de la proteína STAT1.
- Se ha investigado la ubiquitinación STAT1 in vivo.
Principales resultados:
- Las proteínas STAT1 activadas fueron estabilizadas por los inhibidores del proteasoma.
- Se encontró que las proteínas STAT1 están ubiquitinadas in vivo.
- La evidencia sugiere una regulación negativa de STAT1 activado por la vía ubiquitina-proteasoma.
Conclusiones:
- La vía ubiquitina-proteosoma probablemente juega un papel en la regulación de la cantidad de STAT1.1. activado.
- Se necesita más investigación para aclarar completamente el mecanismo de regulación de la proteína STAT.
Videos de Conceptos Relacionados
02:58Regulated Protein Degradation
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...
01:15Receptor Downregulation in MVBs
Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR activation may...
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR activation may...
01:31Regulation of the Unfolded Protein Response
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
02:58Regulated Protein Degradation
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...
01:20The JAK-STAT Signaling Pathway
Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as SH2...
01:16TGF - β Signaling Pathway
The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...