Video Experimental Relacionado
Updated: Aug 28, 2026

12:20
Preparation of Segmented Microtubules to Study Motions Driven by the Disassembling Microtubule Ends
Published on: March 15, 2014
Nuevas características del comportamiento de los microtúbulos observadas in vivo
1Department of Biochemistry and Biophysics, University of California, San Francisco 94143-0448.
Nature
|July 28, 1988
Resumen
La dinámica de los microtúbulos en las células vivas exhibe inestabilidad dinámica, pero difiere del comportamiento in vitro. Los factores citoplasmáticos locales influyen significativamente en la organización de los microtúbulos y en la morfogénesis celular.
Área de la Ciencia:
- Biología celular Biología celular.
- Dinámica del citoesqueleto Dinámica del citoesqueleto
Sus antecedentes:
- Los microtúbulos son cruciales para la polaridad celular y la morfogénesis.
- La polimerización de microtúbulos exhibe una inestabilidad dinámica in vitro, con una interconversión poco frecuente entre los estados de crecimiento y contracción.
- La inestabilidad dinámica permite a los microtúbulos explorar los arreglos celulares y estabilizar morfologías específicas.
Objetivo del estudio:
- Para investigar la regulación de la dinámica de los microtúbulos en las células vivas.
- Para comparar in vivo el comportamiento de los microtúbulos con las propiedades in vitro de la tubulina.
Principales métodos:
- Observación directa de microtúbulos etiquetados con fluorescencia en células vivas individuales.
- Análisis del comportamiento dinámico de cada microtúbulo.
Principales resultados:
- La inestabilidad dinámica explica en gran medida el comportamiento de los microtúbulos in vivo.
- Se observaron desviaciones significativas entre la dinámica de los microtúbulos in vivo y las propiedades de las tubulinas in vitro.
- Se encontró que los factores citoplasmáticos locales influyen fuertemente en la dinámica de los microtúbulos.
Conclusiones:
- La inestabilidad dinámica es un mecanismo clave para el comportamiento de los microtúbulos in vivo.
- Los factores citoplasmáticos juegan un papel crítico en la regulación de la dinámica de los microtúbulos.
- Estos mecanismos reguladores tienen implicaciones significativas para la morfogénesis celular.
Videos de Conceptos Relacionados
Microtubules
There are three types of cytoskeletal structures in eukaryotic cells—microfilaments, intermediate filaments, and microtubules. With a diameter of about 25 nm, microtubules are the thickest of these fibers. Microtubules carry out a variety of functions that include cell structure and support, transport of organelles, cell motility (movement), and the separation of chromosomes during cell division.Microtubules are hollow tubes whose walls are made up of globular tubulin proteins. Each tubulin...
Microtubules
Microtubules are the thickest cytoskeletal filaments with a diameter of 25 nm. In prokaryotic organisms, microtubules are commonly found in locomotory appendages like cilia and flagella. In eukaryotic cells, microtubules form specialized extensions for moving fluid over the surface, like those found in cells lining the intestine.
Microtubules have two structurally similar globular protein subunits: α and β tubulins. In the cytosol, the α and β tubulins form a heterodimer. These αβ-heterodimers...
Microtubules have two structurally similar globular protein subunits: α and β tubulins. In the cytosol, the α and β tubulins form a heterodimer. These αβ-heterodimers...
Microtubule Instability
Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated assembly and...
Microtubule Formation
Microtubules are dynamic structures that undergo continuous assembly and disassembly. They originate from specialized multi-protein complexes known as microtubule organizing centers or MTOCs. Within the MTOC, the point of origin of the microtubule is known as the minus end, while the end radiating outward is the plus end. Microtubules serve two primary functions — the organization of spindle complexes to separate sister chromatids during mitotic or meiotic cell division and the formation of...
Destabilization 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...
Microtubule Instability
Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated assembly and...

