Video Experimental Relacionado
Updated: Oct 14, 2026
10:23
High-resolution Imaging and Analysis of Individual Astral Microtubule Dynamics in Budding Yeast
Published on: April 20, 2017
La dinámica de los microtúbulos modulada por la actividad de hidrólisis del trifosfato de guanosina de la
A Davis1, C R Sage, C A Dougherty
1Department of Biological Sciences, University of California, Santa Barbara 93106.
Science (New York, N.Y.)
|May 6, 1994
Resumen
Alteración de la beta-tubulina de levadura que altera las levaduras.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología Molecular Biología Molecular
- La bioquímica es la bioquímica.
Sus antecedentes:
- La inestabilidad dinámica de los microtúbulos es crucial para la división celular y la segregación cromosómica.
- La hidrólisis del trifosfato de guanosina (GTP) está implicada en la regulación de la dinámica de los microtúbulos.
Objetivo del estudio:
- Para investigar el papel de la hidrólisis de GTP en la inestabilidad dinámica de los microtúbulos.
- Para determinar cómo las mutaciones que afectan a la hidrólisis de GTP influyen en la longitud de los microtúbulos.
Principales métodos:
- Introducción de cuatro mutaciones específicas en la beta-tubulina de levadura en los aminoácidos 103-109.
- Medición de la velocidad dependiente del ensamblaje de la hidrólisis de GTP.
- Cuantificación de las longitudes de microtúbulos en estado estacionario a lo largo del tiempo.
Principales resultados:
- Tres de las cuatro mutaciones aumentaron significativamente la tasa de hidrólisis de GTP.
- Estas tres mutaciones también condujeron a microtúbulos de estado estacionario más largos.
- La cuarta mutación tuvo un impacto mínimo en la velocidad de hidrólisis de GTP y la longitud de los microtúbulos.
Conclusiones:
- La velocidad de hidrólisis de GTP modula directamente la longitud de los microtúbulos.
- Esta modulación influye en la inestabilidad dinámica de los microtúbulos.
- Los residuos específicos de aminoácidos en la beta-tubulina son críticos para regular la hidrólisis de GTP y la dinámica de los microtúbulos.
Más Videos Relacionados
07:21Quantitative Microtubule Fractionation Technique to Separate Stable Microtubules, Labile Microtubules, and Free Tubulin in Mouse Tissues
Published on: November 17, 2023
08:44Visualizing Actin and Microtubule Coupling Dynamics In Vitro by Total Internal Reflection Fluorescence (TIRF) Microscopy
Published on: July 20, 2022
Videos de Conceptos Relacionados
01:35Microtubules
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...
02:14GTPases and their Regulation
Guanine nucleotide-binding proteins (G-proteins), also known as GTPases, are a superfamily of proteins that regulate many cellular processes, such as cell signaling, vesicular transport, and the regulation of cell shape and motility. Mutation or dysfunction of these proteins can lead to disease. There are around 40,000 known G-proteins that can broadly be classified into two groups ‒ small G-proteins consisting of a single domain and large multi-domain G-proteins.
Large G-proteins, also known...
Large G-proteins, also known...
01:18Microtubules
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...
01:23Microtubule 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...
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...
02:17Microtubule 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...