関連する実験動画
Updated: May 23, 2026

08:49
Self-Assembly of Microtubule Tactoids
Published on: June 23, 2022
集団的に動くマイクロチューブルから生じる大規模な渦状の格子
Yutaka Sumino1, Ken H Nagai, Yuji Shitaka
1Aichi University of Education, Aichi 448-8542, Japan.
Nature
|March 23, 2012
まとめ
物理学者は,ダイネインモーターによって推進される自己組織化マイクロチューブルを観察しました. 衝突は,並べ替えを引き起こし,渦の形成と格子構造につながり,集団運動における新しい普遍性クラスを明らかにします.
科学分野:
- 物理 物理学 物理学とは
- バイオフィジックス 生物物理学
- ソフトマター物理学 ソフトマター物理学
背景:
- "自発的集団運動"は,鳥の群れや魚の群れなど,自然界で観察される新興現象である.
- 集団運動の理論的モデルは,特に多くの変数を持つ生物学的システムでは,実験的検証が欠けている.
- サブセルラースケールのインビトロ実験は,理論的なアイデアをテストするための制御された環境を提供します.
研究 の 目的:
- 制御されたインビトロシステムで集団運動のメカニズムを調査する.
- 新興現象に関する理論的予測を実験的に検証する.
- 生物フィラメント系における自己組織化とパターン形成を研究する.
主な方法:
- 表面に結合したダイネイン分子モーターによって推進されるマイクロチューブルを用いた実験.
- 高密度で微小管の相互作用と集団行動の観察.
- 数学的モデルを使用して,観測された新興構造を検証する.
主要な成果:
- 衝突するマイクロチューブルは,互いに並ぶ可能性が高い (ネマティック・アライメント).
- 高密度では,マイクロチューブルが自律的に渦巻き (直径約400μm) に組織され,循環する動きをする.
- 渦は,局所的な相互作用と微小管の動きによって駆動され,より長い時間スケールで格子構造を形成します.
結論:
- この研究は,単純化された生物系における集団運動と自己組織化の出現を示しています.
- 観測された現象は,局所的な相互作用と個々の微小管のダイナミクスによるものであり,遠距離の力によるものではない.
- 発見は,集団運動のための新しい普遍性クラスを示唆し,生物学的構造に影響を及ぼします.
関連する概念動画
Anaphase A and B
Microtubules form through the end-to-end polymerization of tubulin heterodimers. Kinetochore microtubules originate from the spindle poles, and their plus-ends connect with the kinetochores on sister-chromatids. Ndc80 protein complexes, present on the kinetochore, form low-affinity links with the plus end of these kinetochore microtubules.
Plus-end depolymerization releases tubulin heterodimers from the terminal region of the microtubule. As tubulin subunits are lost, the Ndc80 complexes detach...
Plus-end depolymerization releases tubulin heterodimers from the terminal region of the microtubule. As tubulin subunits are lost, the Ndc80 complexes detach...
Microtubules in Cell Motility
Microtubules are thick hollow cylindrical proteins that help form the cytoskeleton. Microtubules have varied roles in the cell. These filaments help form cellular appendages like cilia and flagella, which are responsible for locomotion. The cilia arise from basal bodies, separated from the main body by a membrane-like structure forming the transition zone. This zone is the gate for the entry of lipids and proteins, creating a unique composition of lipids and proteins in the ciliary membrane and...
Microtubules in Cell Motility
Microtubules are thick hollow cylindrical proteins that help form the cytoskeleton. Microtubules have varied roles in the cell. These filaments help form cellular appendages like cilia and flagella, which are responsible for locomotion. The cilia arise from basal bodies, separated from the main body by a membrane-like structure forming the transition zone. This zone is the gate for the entry of lipids and proteins, creating a unique composition of lipids and proteins in the ciliary membrane and...
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 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...
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...

