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関連する概念動画

The Movement of Organelles and Vesicles01:43

The Movement of Organelles and Vesicles

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,...
Microtubule Associated Motor Proteins01:32

Microtubule Associated Motor Proteins

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 cargos...
Clathrin Coated Vesicles01:12

Clathrin Coated Vesicles

Clathrin-coated vesicles use endocytosis to transport receptors and lysosomal hydrolases from the Golgi to the lysosome in the late secretory pathway. Clathrin-mediated endocytosis was the first described endocytic process, and Clathrin-coated vesicles remain one of the most well-studied transport vesicles. The molecular machinery that generates clathrin-coated vesicles comprises over 50 proteins that precisely coordinate vesicle formation. Cell surface receptors concentrated in indented sites...
Nuclear Localization Signals and Import01:46

Nuclear Localization Signals and Import

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...
Directing Proteins to the Rough Endoplasmic Reticulum01:34

Directing Proteins to the Rough Endoplasmic Reticulum

The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
Nuclear Export01:42

Nuclear Export

The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
NES are of three types- the canonical 10-residue long leucine-rich signal and other...

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関連する実験動画

Updated: May 13, 2026

Identification of Kinesin-1 Cargos Using Fluorescence Microscopy
08:06

Identification of Kinesin-1 Cargos Using Fluorescence Microscopy

Published on: February 14, 2016

キネシン-1の構造的基礎:貨物の認識

Stefano Pernigo1, Anneri Lamprecht, Roberto A Steiner

  • 1Randall Division of Cell and Molecular Biophysics, King's College London, London SE1 1UL, UK.

Science (New York, N.Y.)
|March 23, 2013
PubMed
まとめ
この要約は機械生成です。

研究者は,構造的および生体物理的方法を使用して,キネシン-1モータータンパク質がSKIPのような特定の貨物を認識し,結合する方法を明らかにしました. この発見は,細胞機能と疾患に不可欠な細胞内輸送機構を明らかにします.

さらに関連する動画

Cargo Loading onto Kinesin Powered Molecular Shuttles
09:00

Cargo Loading onto Kinesin Powered Molecular Shuttles

Published on: November 3, 2010

Characterizing the Composition of Molecular Motors on Moving Axonal Cargo Using "Cargo Mapping" Analysis
11:09

Characterizing the Composition of Molecular Motors on Moving Axonal Cargo Using "Cargo Mapping" Analysis

Published on: October 30, 2014

関連する実験動画

Last Updated: May 13, 2026

Identification of Kinesin-1 Cargos Using Fluorescence Microscopy
08:06

Identification of Kinesin-1 Cargos Using Fluorescence Microscopy

Published on: February 14, 2016

Cargo Loading onto Kinesin Powered Molecular Shuttles
09:00

Cargo Loading onto Kinesin Powered Molecular Shuttles

Published on: November 3, 2010

Characterizing the Composition of Molecular Motors on Moving Axonal Cargo Using "Cargo Mapping" Analysis
11:09

Characterizing the Composition of Molecular Motors on Moving Axonal Cargo Using "Cargo Mapping" Analysis

Published on: October 30, 2014

科学分野:

  • 分子生物学は分子生物学である.
  • セルラー・トランスポート セルラー・トランスポート
  • 構造生物学 構造生物学とは

背景:

  • キネシン運動タンパク質は,細胞内貨物輸送に不可欠であり,細胞機能に不可欠なプロセスであり,さまざまな疾患に関与しています.
  • キネシン・カーゴ認識の分子メカニズムを理解することは,基本的な細胞プロセスと病理学的経路の解読に不可欠です.

研究 の 目的:

  • トリプトファン酸モチーフを含む貨物ペプチドとのキネシン軽鎖2の相互作用の構造的基礎を決定する.
  • キネシン-1:貨物認識の基礎にある分子メカニズムを解明する.

主な方法:

  • 貨物ペプチドの複合体でキネシン光鎖2テトラトリコペプチドの重複ドメインの構造を得るためのX線結晶学.
  • 結合相互作用と機能的影響を検証するために,生体物理,生化学,および細胞検査を行います.

主要な成果:

  • 結晶構造は,SKIPから派生したトリプトファン酸性モチーフペプチドを持つキネシン光鎖2の複合体を明らかにしています.
  • 構造的および生体物理学的データは,キネシン-1が静電相互作用とシーケンス固有の要素を通じてW-酸性貨物モチーフを結合するモデルをサポートしています.

結論:

  • 細胞内輸送の枠組みは,キネシン-1によるW-酸性貨物モチーフの認識に基づいて提案されています.
  • キネシン-1:カルゴ認識メカニズムに対する直接的な分子証拠が提供され,この基本的な細胞プロセスの理解が進んでいます.