関連する実験動画
Updated: Jun 13, 2026

09:47
Microdissection of Black Widow Spider Silk-producing Glands
Published on: January 11, 2011
保存された蜘蛛の糸領域は,繊維の組み立てを制御する分子スイッチとして機能します
Franz Hagn1, Lukas Eisoldt, John G Hardy
1Center for Integrated Protein Science (CIPSM), Technische Universität München, 85747 Garching, Germany.
Nature
|May 14, 2010
まとめ
クモの糸のタンパク質は,高濃度でも溶解性を持ち,需要に応じて強い繊維を形成します. C端末ドメインである.
科学分野:
- バイオケミストリー バイオケミストリー
- マテリアルサイエンス 材料科学
- 構造生物学 構造生物学とは
背景:
- クモの糸タンパク質は,高濃度でも溶解性を維持する能力がユニークです.
- 需要に応じて安定した繊維に変形することができるが,これは分子レベルで十分に理解されていないプロセスである.
- シルクタンパク質は,重複するコア要素と,保存された非重複する端末ドメインを特徴としています.
研究 の 目的:
- クモ糸の制御された貯蔵と繊維形成の背後にある分子機構を解明する.
- クモの糸タンパク質におけるC端末ドメインの構造的および機能的役割を調査する.
- C端末ドメインがシルクの溶解性および組立性に影響を与える方法を理解する.
主な方法:
- スパイダー・ドラッグライン・シルク・タンパク質のC端末ドメインの溶液構造の決定.
- 糸の溶解性および組み立てを調節するC端末領域の役割の分析.
- 二次構造要素の整合に対するC端末ドメインの影響に関する調査.
主要な成果:
- C端末ドメインの溶液構造が決定されました.
- 証拠によると,C端領域の構造状態は,溶解性のシルクと組み立てられたシルク形態の間の切り替えに不可欠である.
- C末端ドメインは,繊維力学にとって極めて重要な二次構造の調整に役割を果たします.
結論:
- C端末ドメインは,スパイダーシルクタンパク質の制御された貯蔵とオンデマンド組立に不可欠です.
- このドメインは,溶解状態から繊維状態への移行に影響を与えます.
- C末端ドメインの機能は,クモの糸繊維の優れた機械的性質を理解するための鍵です.
関連する概念動画
Generation of Straight or Branched Actin Filaments
The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
Fibrous Proteins
Fibrous proteins are either long and narrow proteins or assemble to form long and thin structures. They contain repetitive units and usually consist of either alpha helices or beta sheets and, in rare cases, a mix of both. The amino acids in the primary structure often consist of repeating amino acid sequences. The role of fibrous proteins is primarily structural. Many are located in the extracellular matrix and are present in connective tissues to impart strength and joint mobility. They are...
Actin Filament Depolymerization
Actin filaments (F-actin) are composed of actin subunits. The dissociation of actin monomers can occur from either end of F-actin. The rate of dissociation is faster from the minus-end or the pointed end, where the actin subunits exist with a bound ADP, together known as ADP-actin. The depolymerization of F-actin is aided by proteins, including the actin-depolymerizing factor (ADF) and cofilin family of proteins, gelsolin, and glia maturation factor (GMF).
In F-actin, the ADF/cofilin proteins...
In F-actin, the ADF/cofilin proteins...
Mechanism of Filopodia Formation
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...
Disassembly of Intermediate Filaments
Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
Formation of Higher-order Actin Filaments
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 networks...
The high-order actin networks...
