フィブリン,フィブロネクチン受容体ベータサブユニットと相互作用する新種のタンパク質であるサイトプラズミックドメイン
W S Argraves1, K Dickerson, W H Burgess
1Biochemistry Laboratory, American Red Cross, Rockville, Maryland 20855.
Cell
|August 25, 1989
まとめ
研究者らは,フィブロネクチン受容体と相互作用する新しい100kDタンパク質であるフィブリンを発見しました. このタンパク質は,細胞粘着受容体と細胞骨格の間の結合を媒介する可能性があります.
科学分野:
- 細胞生物学 細胞生物学
- タンパク質の生化学
- 分子相互作用 分子相互作用
背景:
- フィブロネクチン受容体は,細胞結合と信号伝達において重要な役割を果たします.
- フィブロネクチン受容体と相互作用するタンパク質を理解することは,細胞-マトリックス相互作用の解読の鍵です.
研究 の 目的:
- フィブロネクチン受容体βサブユニットと相互作用する新しいタンパク質を特定し,特徴づけること.
- 細胞粘着プロセスにおける,新たに特定された100 kdのタンパク質の機能的役割を調査する.
主な方法:
- フィブロネクチン受容体βサブユニットのシトプラズマ領域の合成ペプチドを用いたアフィニティクロマトグラフィー.
- 原生フィブロネクチン受容体と45Ca2+を用いたタンパク質結合アッセイ.
- N端のアミノ酸の配列.
- フィブロネクチンに培養された細胞の免疫光染色.
主要な成果:
- 100 kdのタンパク質であるフィブリンが分離され,フィブロネクチン受容体βサブユニットと結合することが示されました.
- フィブリンがフィブロネクチン受容体と結合することは,EDTAで逆転し,カルシウム依存の相互作用を示唆しました.
- フィブリンのN端末配列は,既知のタンパク質データベースと一致しなかった.
- 免疫光検査により,細胞と基板の接触部位において,フィブロネクチン受容体ベータサブユニットとフィブリンがコロカライズすることを明らかにした.
結論:
- フィブリン (fibulin) は,フィブロネクチン受容体と相互作用する新しいタンパク質で, in vitro と in vivo で作用します.
- フィブリンは,粘着受容体を細胞骨格と結びつける媒介として作用する可能性があります.
- 線維素の機能に関するさらなる研究は,細胞結合と信号伝達のメカニズムを明らかにすることができます.
関連する概念動画
Structural Protein Function
Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity. In bones and teeth, it mineralizes to form...
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity. In bones and teeth, it mineralizes to form...
Cytoskeletal Accessory Proteins
The cytoskeleton is an essential cell component that plays several structural and functional roles. However, the filaments that make up the cytoskeleton cannot function independently and depend on the accessory or ancillary proteins to effectively carry out their function. Accessory proteins associate with cytoskeletal filaments and their monomers, aiding filament formation and function. They also help in the cross-communication among cytoskeletal filaments. Cytoskeletal accessory proteins are...
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...
Fibril-associated Collagen
Fibril-associated collagens are a type of collagens present in the extracellular matrix with interrupted triple helices or FACIT (Fibril-associated collagens interrupted triple-helices). FACIT help connect and attach the collagen fibrils with each other as well as with other proteins of the extracellular matrix.
For example, the type II collagen fibrils in cartilage have covalently bound type IX fibril-associated collagens at regular intervals. Other types of fibril-associated collagens are...
For example, the type II collagen fibrils in cartilage have covalently bound type IX fibril-associated collagens at regular intervals. Other types of fibril-associated collagens are...
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...
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...


