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Assembly of Cytoskeletal Filaments01:18

Assembly of Cytoskeletal Filaments

Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
Microtubule Instability02:17

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 Formation01:23

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 Microtubules01:45

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...
Assembly of Complex Microtubule Structures01:32

Assembly of Complex Microtubule Structures

Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
Microtubule Instability02:17

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...

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Updated: May 8, 2026

Simultaneous Visualization of the Dynamics of Crosslinked and Single Microtubules In Vitro by TIRF Microscopy
07:20

Simultaneous Visualization of the Dynamics of Crosslinked and Single Microtubules In Vitro by TIRF Microscopy

Published on: February 18, 2022

急速な微小管の自己組織化運動学

Melissa K Gardner1, Blake D Charlebois, Imre M Jánosi

  • 1Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN 55455, USA.

Cell
|August 23, 2011
PubMed
まとめ
この要約は機械生成です。

マイクロチューブルの組立運動は,これまで考えられていたよりも速い. 自由サブユニット濃度の上昇は,マイクロチューブルサブユニットの結合率と解離率の両方を高め,既存のモデルに挑戦します.

さらに関連する動画

Directly Measuring Forces Within Reconstituted Active Microtubule Bundles
07:47

Directly Measuring Forces Within Reconstituted Active Microtubule Bundles

Published on: May 10, 2022

Self-Assembly of Microtubule Tactoids
08:49

Self-Assembly of Microtubule Tactoids

Published on: June 23, 2022

関連する実験動画

Last Updated: May 8, 2026

Simultaneous Visualization of the Dynamics of Crosslinked and Single Microtubules In Vitro by TIRF Microscopy
07:20

Simultaneous Visualization of the Dynamics of Crosslinked and Single Microtubules In Vitro by TIRF Microscopy

Published on: February 18, 2022

Directly Measuring Forces Within Reconstituted Active Microtubule Bundles
07:47

Directly Measuring Forces Within Reconstituted Active Microtubule Bundles

Published on: May 10, 2022

Self-Assembly of Microtubule Tactoids
08:49

Self-Assembly of Microtubule Tactoids

Published on: June 23, 2022

科学分野:

  • 細胞生物学 細胞生物学
  • バイオフィジックス 生物物理学

背景:

  • 微小管の組成は,細胞機能にとって極めて重要です.
  • 既存のモデルでは,自由サブユニット濃度に関係なく,サブユニット解離率が一定であると仮定しています.

研究 の 目的:

  • マイクロチューブルの組立運動に自由サブユニット濃度の影響を調査する.
  • 現在のモデルにおける独立した解離率の仮定に異議を唱える.

主な方法:

  • 総内部反射-光顕微鏡 (TIRF) を利用しました.
  • 高解像度 in vitro マイクロチューブル組立測定のために,レーザーピンチースアッセイを使用しました.

主要な成果:

  • マイクロチューブルサブユニットの解離率は,自由サブユニット濃度とともに増加することを実証した.
  • 微小管の先端の構造が,濃度が増加するにつれて,ぼんやりから細くなりに変化することが観察されました.
  • アソシエーションとディソシエーションの両方の割合は,より高い濃度で増加することを発見しました.

結論:

  • 微小管の組み立て動態は,以前に推定されたより,数桁の大きさで,著しく速い.
  • この発見は,尖端構造の影響を受けた微小管の組成の二次元モデルを支持する.
  • 微小管の動力学と調節に関する基本的な理解を修正する.