カデリン23とプロトカデリン15は相互作用し,感覚毛細胞の尖端結合繊維を形成する
Piotr Kazmierczak1, Hirofumi Sakaguchi, Joshua Tokita
1The Scripps Research, Institute Department of Cell Biology, La Jolla, California 92037, USA.
Nature
|September 7, 2007
まとめ
2つのタンパク質,カデリン23 (CDH23) とプロトカデリン15 (PCDH15) が相互作用して,内耳で重要な尖端リンクを形成します. これらのタンパク質の相互作用は,聴覚とバランスの維持に不可欠であり,その障害が聴覚障害を引き起こす.
科学分野:
- 聴覚神経科学は,聴覚に関する神経科学です.
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- 内耳の毛細胞は,聴覚とバランスのための重要なメカノセンサです.
- 毛細胞のステレオシリア束は,端のリンクで接続され,ゲートメカニカルトランスデュークションチャネルを接続します.
- 尖端リンクの分子組成は議論されてきた.
研究 の 目的:
- 内耳毛細胞の先端リンクの分子成分を決定する.
- チップリンクの形成におけるカデリン23 (CDH23) とプロトカデリン15 (PCDH15) の相互作用を調査する.
- CDH23とPCDH15の変異が,先端リンクの整合性に影響し,聴覚障害を引き起こす方法を理解する.
主な方法:
- ネズミの毛細胞の免疫ヒストキミストリーは,CDH23とPCDH15を局所化する.
- CDH23ホモディマーとPCDH15ホモディマー相互作用を評価するための生化学実験.
- タンパク質の相互作用に対するイオン効果とPCDH15変異の分析.
主要な成果:
- CDH23とPCDH15は,それぞれ先端リンクの上部と下部に局在していた.
- CDH23ホモダイマーがPCDH15ホモダイマーと相互作用して,先端リンクに似た構造を形成する.
- 尖端リンクの整合性と機能は,特定のイオンと聴覚障害に関連したPCDH15変異によって破壊され,CDH23-PCDH15相互作用に影響します.
結論:
- チップリンクは,相互作用するCDH23およびPCDH15タンパク質から分子的に構成されています.
- これらの相互作用は,毛細胞におけるメカニカル伝導に極めて重要です.
- CDH23-PCDH15相互作用の欠陥は,遺伝的な聴覚およびバランス障害を理解するための基礎を提供します.
関連する概念動画
01:22Hair Cells
36.1K
Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
36.1K
01:25Structure of Cadherins
4.0K
The cadherins were one of the first cell adhesion molecules discovered; the term “cadherins” is based on their calcium-dependent adhering properties. The first cadherins discovered on the epithelial, neuronal, and placental cells were named E-cadherin, P-cadherin, and N-cadherin, respectively. These classical cadherins share sequence and structural similarities. Other cadherins, including those involved in cell signaling, are grouped into non-classical cadherins. This...
4.0K
01:23Catenins
2.2K
Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the...
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the...
2.2K
01:24Adherens Junctions
5.8K
Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types – adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
Adherens Junctions are Dynamic
Adherens Junctions are Dynamic
5.8K
01:19Cadherins in Tissue Organization
3.5K
The cadherins are a superfamily of cell adhesion molecules comprising over 180 variants, with specific tissues expressing a particular combination of cadherin types. Cadherins generally exhibit homophilic binding; i.e., cadherins on one cell bind to cadherins of the same or closely related type on another cell. Thus, cells of the same type have a specific affinity to bind to each other and sort themselves into clusters to form tissues.
Cell Sorting During Development
Cell sorting plays an...
Cell Sorting During Development
Cell sorting plays an...
3.5K
01:26Tension Response at Adherens Junctions
3.2K
The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
α-Catenin as a Mechanosensory Protein
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin...
α-Catenin as a Mechanosensory Protein
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin...
3.2K