Video Experimental Relacionado
Updated: Jul 21, 2026
05:35
Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins
Published on: March 3, 2016
Regulación mitótica de la actividad de reticulación de microtúbulos de la proteína cinetocoro CENP-E
Science (New York, N.Y.)
|July 15, 1994
Resumen
La proteína E del centromero (CENP-E) enlaza los microtúbulos en la zona media del husillo durante la anafase. Esta actividad está regulada por la fosforilación del factor promotor de la maduración (MPF), que se pierde en la anafase.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología Molecular Biología Molecular
- La bioquímica es la bioquímica.
Sus antecedentes:
- CENP-E es una proteína parecida a la quinesina crucial para la mitosis.
- Se localiza en los cinetocoros al principio de la mitosis y en la zona media del huso durante la anafase.
- Su función implica la unión y el enlace cruzado de microtúbulos.
Objetivo del estudio:
- Para investigar el mecanismo de la actividad de enlace cruzado de microtúbulos del CENP-E.
- Para determinar el papel del dominio carboxilo-terminal en la función CENP-E.
- Para entender la regulación de la actividad de CENP-E por fosforilación.
Principales métodos:
- Ensayos de unión de microtúbulos.
- Análisis de la fosforilación del CENP-E por el factor promotor de la maduración (MPF).
- Estudios de localización durante la mitosis.
Principales resultados:
- CENP-E se une a los microtúbulos a través de su terminal amino y un dominio carboxilo-terminal distinto.
- La fosforilación del extremo carboxilo por MPF inhibe la unión de los microtúbulos.
- La inhibición mediada por MPF se pierde en la anafase, permitiendo el enlace cruzado de microtúbulos.
Conclusiones:
- El MPF regula la actividad de enlace cruzado de microtúbulos del CENP-E inhibiendo su dominio carboxilo-terminal.
- Esta regulación asegura las funciones CENP-E en la zona media del husillo sólo durante la anafase.
- CENP-E juega un papel clave en la mecánica de la segregación cromosómica.
Más Videos Relacionados
08:33Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis
Published on: December 5, 2017
12:26Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
Published on: May 3, 2018
Videos de Conceptos Relacionados
01:45Destabilization of Microtubules
The destabilization of microtubules can occur during different stages of the microtubule lifecycle, such as nucleation or elongation. It can take place at either end of the microtubule or in the microtubule lattices as a whole. The lifespan of individual microtubules within a cell varies according to the cell type and stage of the cell cycle. During interphase, the lifespan of the microtubule is about 30 minutes, while during cell division, it is about 15 minutes. In axonal microtubules of...
02:25Centrosome Duplication
The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...
02:57Attachment of Sister Chromatids
As cells progress into mitosis, the nuclear envelope breaks down, and the condensed chromosomes are exposed to the array of bipolar microtubules of the mitotic spindle. The kinetochore, a large, disc-shaped protein complex, is present at the centromere region of the sister chromatids and acts as a binding site for the microtubules. Usually, the plus-end of a single microtubule is embedded within the kinetochore. However, some kinetochores first establish lateral contact with the side-wall of a...
02:17Separation of Sister Chromatids
At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
At the onset of anaphase, separase, a proteolytic enzyme, is...
02:19The Spindle Assembly Checkpoint
The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
02:25Centrosome Duplication
The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...