関連する実験動画
Updated: Apr 13, 2026

08:06
Identification of Kinesin-1 Cargos Using Fluorescence Microscopy
Published on: February 14, 2016
8.4K
MAPとキネシンに依存した核定位は,骨格筋の機能のために必要です
Thomas Metzger1, Vincent Gache, Mu Xu
1Program in Developmental Biology, Sloan-Kettering Institute, New York, New York 10065, USA.
Nature
|March 20, 2012
まとめ
研究者らは,マイクロチューブル関連タンパク質エンスコシン (Ens) /マイクロチューブル関連タンパク質7 (MAP7) とキネシン重鎖 (Khc) /Kif5bが,筋肉繊維内の核の位置づけに不可欠であることを発見しました. この発見は,筋肉の機能と疾患を理解するために不可欠です.
科学分野:
- 細胞生物学 細胞生物学
- 筋肉生理学 筋肉生理学
- 発達生物学 発達生物学とは
背景:
- 骨格筋のミオファイバーには,最適な機能のために正確に配置された複数の核が含まれています.
- ミヨヌクレア定位を制御する分子機構は,ほとんど未知のままである.
- 誤った位置の核は,中心核ミオパシーなどの様々な筋肉疾患に関連しています.
研究 の 目的:
- 骨格筋のミヨヌクレア定位に責任を負う分子機構を特定する.
- 筋肉機能のための正しい核の位置づけの生理学的重要性を調査する.
主な方法:
- ドロソフィラと哺乳類の培養ミオチューブをモデルシステムとして利用した.
- 遺伝的および生化学的アプローチを使用して,重要なタンパク質を特定しました.
- 核の位置づけと筋肉機能に対するタンパク質の枯渇と救出実験の影響を評価した.
主要な成果:
- ミヨヌクレア定位の重要な調節体としてエンスコシン (Ens) /マイクロチューブル関連タンパク質7 (MAP7) とキネシン重鎖 (Khc) /Kif5bを特定した.
- MAP7とKhcの間の物理的な相互作用が示され,MAP7はKhcをマイクロチューブルと結びつける.
- ドロソフィラ変異体の核定位の障害は運動の減少につながり,それはEns.発現の回復によって救われることを示しました.
結論:
- MAP7とKhcは進化的に保存されたタンパク質で,ミオ核の適切な位置づけを維持するために不可欠です.
- 正確な核の位置づけは,正常な筋肉の機能に不可欠です.
- 欠陥のある核定位は,細胞自律的な方法で筋肉機能障害に寄与する.
関連する概念動画
Microtubule Associated Motor Proteins
11.8K
Eukaryotic cells have different motor proteins for transporting various cargo within the cell. These motor proteins differ based on the filament they associate with, the direction they move within the cell, and the type of cargo they transport. Motor proteins that associate with microtubules are known as microtubule-associated motor proteins. There are two families of microtubule-associated motor proteins —Kinesins and Dyneins. Both these proteins assist in the transport of cellular...
11.8K
The Movement of Organelles and Vesicles
7.4K
In eukaryotic cells, cytoskeletal filaments such as actin, microtubules, and intermediate filaments form a mesh-like cytoskeletal network. These filaments serve as tracks for transporting cellular cargo. Specialized motor proteins use the chemical energy stored in adenosine triphosphate (ATP) for this transport. During interphase, microtubules are polarized, with the plus-end towards the cell periphery and the minus-end towards the cell center. Two microtubule-associated motor proteins,...
7.4K
Nuclear Protein Sorting
6.7K
Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
6.7K
Nuclear Localization Signals and Import
8.4K
Proteins targeted to the nucleus carry short stretches of amino acid sequences called the nuclear localization signal or NLS. Classical nuclear localization signals are of two types: monopartite and bipartite NLS. Monopartite classical NLS (cNLS) consists of a single cluster of 4-8 amino acids. Bipartite cNLS consists of two clusters of 2-3 amino acids and a 9-12 residue long proline-rich linker bridging the two clusters. Signal clusters are rich in positively charged amino acids such as...
8.4K
Forces Acting on Chromosomes
4.1K
During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis.
Microtubules and motor proteins exert two types of forces on...
Microtubules and motor proteins exert two types of forces on...
4.1K
Role of Myosin in Cell Migration
3.8K
Myosins are multimeric motor proteins involved in various cellular processes such as migration, adhesion, and proliferation. Myosin II is the most common type in animal cells, which binds and cross-links actin filaments.
Myosin II is a hexamer comprising two heavy chains with globular heads and coiled-coil tails, two regulatory light chains, and two essential light chains. The ATPase sites on the myosin heads hydrolyze ATP, and the released phosphate generates the force for contraction....
Myosin II is a hexamer comprising two heavy chains with globular heads and coiled-coil tails, two regulatory light chains, and two essential light chains. The ATPase sites on the myosin heads hydrolyze ATP, and the released phosphate generates the force for contraction....
3.8K

