関連する実験動画
Updated: Jul 13, 2026
07:24
A Simple Hanging Drop Cell Culture Protocol for Generation of 3D Spheroids
Published on: May 6, 2011
酸性および塩基性線維芽細胞成長因子の3次元構造
1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena 91125.
Science (New York, N.Y.)
|January 4, 1991
まとめ
線維細胞成長因子 (FGF) の構造分析は,保存されたタンパク質の折りたたみを示しています. この構造は,細胞増殖と分化に不可欠な受容体とヘパリン結合部位の洞察を提供します.
科学分野:
- バイオケミストリー バイオケミストリー
- 構造生物学 構造生物学とは
- 分子生物学は分子生物学である.
背景:
- 線維細胞成長因子 (FGF) は,細胞増殖と分化の主な調節因子である.
- 受容体媒介経路は,FGFシグナル伝達に不可欠である.
- FGFの構造を理解することは,その生物学的機能を解明するために非常に重要です.
研究 の 目的:
- 牛の酸性FGFと人間の基本性FGFの3次元構造を決定する.
- FGFファミリー内の保存された構造的特徴と潜在的な機能的なサイトを特定する.
- FGFの構造を他の関連タンパク質と比較する.
主な方法:
- タンパク質構造の結晶学的決定.
- タンパク質の折り畳みパターンと内部対称性の分析.
- 保存された地域と機能的なサイトを特定するためのシーケンス分析.
主要な成果:
- 牛の酸性FGFと人間の塩基性FGFの3次元構造を決定した.
- この2つの構造は,約3倍の内部対称性を持つ12の反パラレルベータ鎖の保存された折りたたみを示しています.
- 特定された潜在的な受容体およびヘパリン結合部位,ベータシート鎖を含む 10.
- 大豆のトリプシン阻害剤とインタールイキン-1βおよび-1αとのトポロジカル類似性が観察されました.
結論:
- 保存されたFGFタンパク質の折り畳みは,その機能に不可欠です.
- 特定の構造領域は,受容体とヘパリン結合に関与しています.
- 構造的な類似性は,進化の関係を示唆し,他のタンパク質ファミリーと機能的なメカニズムを共有しています.
関連する概念動画
02:21Globular and Fibrous Proteins
Many proteins can be classified into two distinct subtypes - globular or fibrous. These two types differ in their shapes and solubilities.
Globular proteins are also known as spheroproteins and typically are approximately round in shape. They contain a mix of amino acid types and contain differing sequences in their primary structures. Globular proteins have many different functions, such as enzymes, cellular messengers, and molecular transporters. These roles often require the proteins to be...
Globular proteins are also known as spheroproteins and typically are approximately round in shape. They contain a mix of amino acid types and contain differing sequences in their primary structures. Globular proteins have many different functions, such as enzymes, cellular messengers, and molecular transporters. These roles often require the proteins to be...
01:56Structural 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...
01:18Assembly of Cytoskeletal Filaments
Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
01:14Generation 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...
01:19The Structure of Intermediate Filaments
The intermediate filaments are one of three widely studied cytoskeletal filaments. They are so named as their diameter (10 nm) is in between that of microfilaments (7 nm) and the microtubules (25 nm). These filaments are highly stable and can remain intact when exposed to high salt concentrations and detergents. These filaments are responsible for providing stability and mechanical support to the cells. They also help in cell adhesion and maintaining tissue integrity.
Intermediate filaments...
Intermediate filaments...
00:55Fibrous 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...