Video Experimental Relacionado
Updated: May 2, 2026
10:57
Growth-based Determination and Biochemical Confirmation of Genetic Requirements for Protein Degradation in Saccharomyces cerevisiae
Published on: February 16, 2015
8.8K
Srb10/Cdk8 regula el crecimiento filamentoso de la levadura mediante la fosforilación del factor de transcripción
Chris Nelson1, Susan Goto, Karen Lund
1Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada.
Nature
|January 10, 2003
Resumen
La cinasa dependiente de la ciclina Srb10 regula el crecimiento filamentoso de la levadura mediante la fosforilación de Ste12. La limitación de nutrientes reduce la actividad de Srb10, promoviendo la función de Ste12 y el desarrollo pseudohifal en Saccharomyces cerevisiae.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología molecular La biología molecular.
- Genética de la levadura genética de la levadura.
Sus antecedentes:
- La levadura en ciernes Saccharomyces cerevisiae exhibe un crecimiento filamentoso bajo la limitación de nutrientes.
- Esta diferenciación se basa en el factor de transcripción Ste12 y la cascada de MAP quinasa.
- El mecanismo regulador de Ste12 por la limitación de nutrientes no estaba previamente definido.
Objetivo del estudio:
- Aclarar el mecanismo que regula la función de Ste12 durante el crecimiento filamentoso limitado por nutrientes.
- Para identificar el papel de la cinasa dependiente de ciclina Srb10 en este proceso.
Principales métodos:
- Investigó la interacción entre Srb10 y Ste12.
- Se analizó la actividad de la quinasa del Srb10 y su efecto sobre la fosforilación y la estabilidad del Ste12.
- Utilizó mutaciones genéticas para evaluar el impacto en el crecimiento filamentoso y la respuesta de las feromonas.
Principales resultados:
- Srb10 (Cdk8) inhibe el crecimiento filamentoso mediante la fosforilación y desestabilización de Ste12 en un medio rico.
- La limitación de nitrógeno conduce a una disminución de la actividad de la proteína y la quinasa Srb10, reduciendo la fosforilación de Ste12.
- Las mutaciones en los sitios de fosforilación dependientes de Srb10 mejoran el desarrollo seudohifal sin afectar la respuesta feromónica.
Conclusiones:
- Srb10 actúa como un regulador clave de la actividad de Ste12 para el crecimiento filamentoso en respuesta a la limitación de nitrógeno.
- La actividad de la Srb10 quinasa se regula independientemente de la vía de feromonas de apareamiento.
- Srb10 coordina la expresión génica con el potencial de crecimiento mediante la regulación de los factores de transcripción basados en señales fisiológicas.
Videos de Conceptos Relacionados
02:39Positive Regulator Molecules
5.3K
Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
5.3K
02:34Inhibition of Cdk Activity
4.8K
The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
4.8K
01:02Role of Microtubules in Cell Wall Deposition
2.5K
Microtubules are small hollow tubes in eukaryotic cells. The cell wall microtubules are polymerized dimers of two globular proteins, α-tubulin and β-tubulin, two globular proteins. With a diameter of about 25 nm, microtubules are the widest components of the cytoskeleton. They help the cell resist compression and provide a track along which vesicles move through the cell or pull replicated chromosomes to opposite ends of a dividing cell. Microtubules go through quick cycles of...
2.5K
01:26Bacterial Protein Maturation
744
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...
744
01:17Gene Regulation During Sporulation
713
Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...
713
01:22Bioreactor Controls-III
67
Strain improvement is a foundational strategy in industrial microbiology aimed at maximizing microbial productivity, particularly because natural isolates typically yield commercially valuable products in very low concentrations. Although optimizing the culture medium and environmental conditions can improve yields, these adjustments are inherently limited by the organism’s genetic potential. As a result, the focus shifts toward genetic modifications to enhance biosynthetic capacity. The...
67