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関連する概念動画

Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

3.2K
Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
Another mechanism for membrane domain formation involves membrane proteins interacting with...
3.2K
Mechanism of Lamellipodia Formation01:31

Mechanism of Lamellipodia Formation

2.8K
Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
2.8K
Mechanism of Filopodia Formation01:39

Mechanism of Filopodia Formation

2.5K
Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
2.5K
Membrane Fluidity01:26

Membrane Fluidity

12.2K
Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is...
12.2K
Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

457
Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
457
Fluid Mosaic Model01:19

Fluid Mosaic Model

13.1K
Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
13.1K

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関連する実験動画

Updated: Sep 19, 2025

In Vitro Reconstitution of Self-Organizing Protein Patterns on Supported Lipid Bilayers
08:10

In Vitro Reconstitution of Self-Organizing Protein Patterns on Supported Lipid Bilayers

Published on: July 28, 2018

12.4K

インターフェイスタンパク質による多相コアセルバトの浸潤と自己組織化を制御する

Tiemei Lu1,2, Susanne Liese3, Brent S Visser1

  • 1Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, Nijmegen 6525 AJ, The Netherlands.

Journal of the American Chemical Society
|June 17, 2025
PubMed
まとめ

アルファシヌクレイン (αSyn) のような表面活性タンパク質は,多相生物分子凝縮物の組織を制御する. αSynを導入すると,ネストドットレットは接続されたネットワークに変換され,細胞組織に影響を及ぼすダイナミックな"コアセルバートポリマー"を形成します.

さらに関連する動画

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

18.8K
Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
10:11

Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer

Published on: April 19, 2021

3.9K

関連する実験動画

Last Updated: Sep 19, 2025

In Vitro Reconstitution of Self-Organizing Protein Patterns on Supported Lipid Bilayers
08:10

In Vitro Reconstitution of Self-Organizing Protein Patterns on Supported Lipid Bilayers

Published on: July 28, 2018

12.4K
Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

18.8K
Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
10:11

Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer

Published on: April 19, 2021

3.9K

科学分野:

  • 細胞生物学
  • バイオ物理学
  • 材料科学

背景:

  • 生物分子凝縮物は細胞プロセスを組織し,しばしば多相構造を示します.
  • 細胞における多相構造間の変換の調節は十分に理解されていない.

研究 の 目的:

  • 表面活性タンパク質が多相コアセルバートの湿潤と自己組織化にどのように影響するかを調査する.
  • コンデンサート構造と相互作用を調節する際のインターフェイスタンパク質の役割を理解する.

主な方法:

  • モデルシステムとして多相コアセルバート (UTP/pLL/R10) を利用した.
  • 表面活性タンパク質アルファ-シヌクレイン (αSyn) を導入し,コアセルバット界面への影響を研究した.
  • 観察された湿気移行を説明する理論的モデルを開発した.

主要な成果:

  • αSynは,多相コアセルバットにおいて,ネスト状態から部分的に濡れた状態への移行を誘導した.
  • 部分的に濡れた滴は,ポリマーに似た動的,安定したネットワーク ("コアセルベートポリマー") を形成した.
  • 様々なタンパク質 (BSA,mCherry,FtsZ) は,表面活動と組織的効果が類似していることが示された.

結論:

  • インターフェイスタンパク質は,多相コンデンサ組織とコンデンサ間の相互作用を制御することができます.
  • このメカニズムは,凝縮液の安定性およびネットワーク形成の細胞調節に不可欠である可能性があります.
  • 発見は,凝縮物構造に対するタンパク質媒介制御の一般的原理を示唆する.