関連する実験動画
Updated: Jul 17, 2026

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Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
Published on: June 13, 2014
インテグリンという,ファイブロネクチンとアクチン間のトランスメブラン結合に関与するグリコタンパク質の構造
Cell
|July 18, 1986
まとめ
研究者らは,細胞外マトリックスと細胞骨格の結合に不可欠な,新しい膜グリコタンパク質複合体,インテグリンを特定しました. このタンパク質は,ユニークな構造領域と潜在的なリン酸化部位を特徴としており,細胞粘着におけるその役割を強調しています.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- バイオケミストリー バイオケミストリー
背景:
- 細胞外マトリックス (ECM) と細胞骨格は相互作用し,細胞の構造と機能を維持する.
- この超膜結合の分子メカニズムを理解することは,細胞生物学にとって不可欠です.
研究 の 目的:
- ECM-細胞骨格結合複合体のサブユニットをコードするcDNAクローンを分離,特徴づけ,配列化する.
- このタンパク質複合体の名前を提案し,構造的特徴と潜在的な機能を明らかにする.
主な方法:
- cDNAクローンの分離と特徴付け.
- ポリペプチド配列を決定するためのDNA配列解析.
- 暗号化されたポリペプチド構造のバイオ情報分析.
主要な成果:
- 89 kDaのポリペプチドサブユニットをコードするcDNAを識別し,配列化した.
- ポリペプチドは,新しいシステインに富んだ繰り返し,トランスメブランセグメント,小さな細胞膜領域を持つ大規模な細胞外ドメインを有しています.
- 細胞プラズマ領域には,潜在的なチロシンリン酸化部位が含まれています.
結論:
- この統合膜タンパク質複合体に対して"インテリン"という名称を提案した.
- インテグリンは,ECMと細胞骨格の間のトランスメブラン関連において重要な役割を果たします.
- 構造的な特徴は,細胞結合とシグナル伝達における機能的役割を示唆する.
関連する概念動画
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...
Fibronectins Connect Cells with ECM
Fibronectin is an adhesive glycoprotein present in the extracellular matrix of embryogenic and adult tissue. These molecules primarily aid in regulating cell motility and attachment. A fibronectin molecule is composed of two identical polypeptide chains attached to each other by a pair of disulfide bonds at the C-terminal.
Both proteoglycans and collagen are attached to fibronectin proteins, which, in turn, are attached to integrin proteins. These integrin proteins interact with transmembrane...
Both proteoglycans and collagen are attached to fibronectin proteins, which, in turn, are attached to integrin proteins. These integrin proteins interact with transmembrane...
Integrins
Animal and protozoan cells do not have cell walls to help maintain shape and provide structural stability. Instead, these eukaryotic cells secrete a sticky mass of carbohydrates and proteins into the spaces between adjacent cells. This network of proteins and molecules is called an extracellular matrix or ECM.
Some ECM proteins assemble into a basement membrane to which the remaining components adhere. Proteoglycans typically form the bulk of the ECM while fibrous proteins, like collagen,...
Some ECM proteins assemble into a basement membrane to which the remaining components adhere. Proteoglycans typically form the bulk of the ECM while fibrous proteins, like collagen,...
Activation of Integrins
Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
In "outside-in signaling," external factors in the extracellular space bind to exposed ligand binding sites on integrins. This causes the inactive protein to undergo a conformational change to become active. Integrins are often clustered on the cell membrane. Repetitive and regularly spaced ligand binding events provide an effective stimulus.
In "outside-in signaling," external factors in the extracellular space bind to exposed ligand binding sites on integrins. This causes the inactive protein to undergo a conformational change to become active. Integrins are often clustered on the cell membrane. Repetitive and regularly spaced ligand binding events provide an effective stimulus.
Intracellular Signaling Affects Focal Adhesions
Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Some...
Anchoring Junctions
Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...

