Video Experimental Relacionado
Updated: Jul 13, 2026
12:28
Protein Purification Technique that Allows Detection of Sumoylation and Ubiquitination of Budding Yeast Kinetochore Proteins Ndc10 and Ndc80
Published on: May 3, 2015
Un factor similar a E3 que promueve la conjugación SUMO con las septinas de la levadura
1Department of Biochemistry and Molecular Pharmacology, Thomas Jefferson University, Philadelphia, PA 19107, USA. erica.johnson@mail.tju.edu
Cell
|September 27, 2001
Resumen
Siz1 es un factor de tipo E3 esencial para la SUMOilación de las septinas de la levadura. Siz1 y Siz2 promueven la conjugación SUMO con varios sustratos, destacando sus roles cruciales en los procesos celulares.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología celular Biología celular.
- La bioquímica es la bioquímica.
Sus antecedentes:
- La SUMOilación, una modificación post-traducional, regula procesos celulares críticos como la transducción de señales y el crecimiento.
- Comprender las enzimas involucradas en la SUMOilación es clave para descifrar estos mecanismos reguladores.
Objetivo del estudio:
- Caracterizar Siz1 como un potencial factor similar a E3 en la vía de SUMOilación.
- Para investigar el papel de Siz1 y Siz2 en la conjugación SUMO en la levadura.
Principales métodos:
- Ensayos in vivo e in vitro para evaluar la SUMOilación.
- Caracterización de la actividad enzimática de Siz1.
- Análisis de la función Siz1 y Siz2 en el contexto del ciclo celular.
Principales resultados:
- Siz1 se identifica como un factor E3-como crucial para el apego de SUMO a S. cerevisiae septins.
- Siz1 mejora significativamente la sumoilación de la septina in vitro.
- Siz1 y Siz2 exhiben especificidad de sustrato y regulación temporal de la conjugación SUMO a lo largo del ciclo celular.
Conclusiones:
- Siz1 y Siz2 son reguladores clave de la conjugación SUMO en la levadura, actuando en sustratos distintos en diferentes etapas del ciclo celular.
- La familia de proteínas Siz/PIAS, caracterizada por un motivo relacionado con RING, probablemente funciona para promover la SUMOilación de objetivos proteicos específicos.
Videos de Conceptos Relacionados
02:04Covalently 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.
These groups modify specific amino acids in a protein.
01:57Protein Complexes with Interchangeable Parts
Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
02:53Conservative Site-specific Recombination and Phase Variation
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
The recognition sites for Cre recombinase called LoxP...
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...
01:26Protein Modifications in the RER
Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal sequences.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal sequences.
01:26Bacterial Protein Maturation
Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...