閉じ込めとアクチンクロスリンクの間のメカノケミカルフィードバックは,液体のような滴の形状ダイナミクスを駆動します
Daniel Mansour1, Dominique Jordan2, Caleb Walker2
1Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, CA, USA.
Nature communications
|February 23, 2026
まとめ
アクチン結合タンパク質は,ダイナミックなコンデンサートを形成し,バンドル化されたアクチンリングとディスクを形成します. ドロップレットメカニクスとクロスリンカー特性の間のメカノケミカルフィードバックは,アクチン組織とドロップレット形状を制御します.
科学分野:
- バイオフィジックス 生物物理学
- 細胞生物学 細胞生物学
- ソフトマター物理学 ソフトマター物理学
背景:
- アクチン結合タンパク質は,アクチンフィラメントの組立と束縛に不可欠な相分離コンデンサートを形成します.
- クロスリンカー多価性,アクチンダイナミクス,コンデンサート力学とアクチン組織を結びつける正確なメカニズムは不明である.
研究 の 目的:
- クロスリンカーの多価性,アクチンの成長,そしてコンデンサート力学がアクチンの組織とドロップレット形状をどのように調節するかを明らかにする.
- ドロップレットインターフェイスの力学とアクチンネットワークの特性との相互作用を調査する.
主な方法:
- アクチン・クロスリンカーシステムをモデル化するために,エージェントベースのシミュレーションが採用されました.
- シミュレーションの予測を検証するために実験的アプローチが使用されました.
- バンドルの厚さ,ドロップレット直径,変形ダイナミクスを含むコンデンサートの性質の特徴化.
主要な成果:
- 動的に変形可能なドロップレットインターフェースは,緊密に結合したアクチン環と弱い結合したアクチン円盤の形成を促します.
- 交互接続された束の厚さとドロップレット直径の間には,実験データと一致するパワー・ロー関係が観察されました.
- ドロップレット変形ダイナミクスは,表面張力とクロスリンカー結合運動の影響によるスナップ行動を示します.
結論:
- ドロップレットインターフェイスメカニズムとクロスリンカーの多価性との間の機械化学的フィードバックは,コンデンサ内のアクチン組織の重要な決定因子です.
- このフィードバックメカニズムは,内部アクチンネットワークによって駆動されるドロップレット変形ダイナミクスを制御します.
- この発見は,血管拡張剤刺激型フォスホプロテイン,ラメリポディン,RGG.など,様々なアクチン結合タンパク質に適用できる汎用的な洞察を提供します.
関連する概念動画
Mechanism of Lamellipodia Formation
3.8K
Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
3.8K
Actin Polymerization and Cell Motility
6.9K
Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate....
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate....
6.9K
Cell-matrix's Response to Mechanical Forces
3.7K
In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue.
Anchoring junctions mechanically attach a cell to the...
Anchoring junctions mechanically attach a cell to the...
3.7K
Cell Motility through Blebbing
2.6K
Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
Blebbing Through the Matrix
In multicellular...
Blebbing Through the Matrix
In multicellular...
2.6K
Mechanism of Filopodia Formation
3.3K
Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
3.3K
Formation of Higher-order Actin Filaments
3.7K
The polymerization of G-actin monomers into filamentous F-actin is a multi-step process. Once the F-actins are formed, they can bundle together in different arrangements to form higher-order networks and regulate cellular functions. Common examples include the formation of lamellipodia and filopodia at the cell's leading edge by actin reorganization in a migrating cell. The microvilli on the brush border epithelial cells are also formed through the F-actin network.
The high-order actin...
The high-order actin...
3.7K


