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Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

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 cytoskeletal...
Assembly of the Lipid Bilayer in the ER01:28

Assembly of the Lipid Bilayer in the ER

Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
A large chunk of any biological membrane is composed of phospholipids. These lipids have a heterogeneous distribution across different subcellular organelles and even between...
Membrane Fluidity01:26

Membrane Fluidity

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 a relatively...
Membrane Fluidity01:23

Membrane Fluidity

Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.Fatty acids tails of phospholipids can be either saturated or...
Protein Complex Assembly02:41

Protein Complex Assembly

Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Protein Complex Assembly02:41

Protein Complex Assembly

Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...

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Native Cell Membrane Nanoparticles System for Membrane Protein-Protein Interaction Analysis
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膜脂質は,タンパク質複合体の組立-分解に影響を与えます.

Leah Shin1, Won Jin Cho, Jeremy D Cook

  • 1Department of Physiology, Wayne State University School of Medicine, Detroit, Michigan 48201, USA.

Journal of the American Chemical Society
|April 9, 2010
PubMed
まとめ
この要約は機械生成です。

コレステロール関連小胞は,L-アルファ-リソファファティディルコリン (LPC) 小胞と比較して,より小さなt-/v-SNARE環複合体を産生します. また,LPCは,これらの複合体内のβシート構造のN-エチルマレイミド感受因子+アデノシン三リン酸誘発解体を促進する.

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Using Scaffold Liposomes to Reconstitute Lipid-proximal Protein-protein Interactions In Vitro

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A Model Membrane Platform for Reconstituting Mitochondrial Membrane Dynamics
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A Model Membrane Platform for Reconstituting Mitochondrial Membrane Dynamics

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関連する実験動画

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07:31

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08:53

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A Model Membrane Platform for Reconstituting Mitochondrial Membrane Dynamics
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A Model Membrane Platform for Reconstituting Mitochondrial Membrane Dynamics

Published on: September 2, 2020

科学分野:

  • バイオケミストリー バイオケミストリー
  • 分子生物学は分子生物学である.
  • バイオフィジックス 生物物理学

背景:

  • 溶性NSF付着タンパク質受容体 (SNAREs) は,細胞輸送における重要なプロセスである膜融合を媒介する.
  • SNARE複合体の組立と分解を制御する正確な構造的メカニズムと脂質相互作用は,まだ完全に理解されていません.
  • SNAREの複雑なダイナミクスを理解することは,細胞内トラフィックの経路を解読する上で極めて重要です.

研究 の 目的:

  • 異なる脂質,特にコレステロールとL-アルファ-リソホスファティディルコレリン (L-alpha-lysophosphatidylcholine,LPC) がt-/v-SNARE複合体の構造特性に及ぼす影響を調査する.
  • 異なる脂質環境の存在下でSNARE複合体の構造を調節するN-エチルマレイミド感受性因子 (NSF) とアデノシン三リン酸 (ATP) の役割を明らかにする.

主な方法:

  • 原子力顕微鏡 (AFM) を用いて,コレステロール関連ベシクルとLPCを含むベシクルで形成されたt-/v-SNARE環複合体の大きさを測定した.
  • 循環型二重化 (CD) スペクトロスコーピーは,異なる条件下でt-/v-SNARE複合体内の二次構造変化 (βシートおよびアルファヘリカル含有量) を分析するために使用されました.

主要な成果:

  • コレステロール関連小胞で形成されたt-/v-SNARE環複合体は,LPCを含む小胞で形成されたものより約11%小さかった.
  • CDスペクトロスコーピーは,LPCの存在下では,NSF + ATPがt-/v-SNARE複合体内のβシート構造の重要な分解を誘導することを明らかにしました.
  • t-/v-SNARE複合体のアルファヘリル含有量は,LPCの存在下でNSF+ATPの影響を受けなかった.

結論:

  • コレステロールとLPCは,t-/v-SNARE複合体のサイズと構造的整合性を差異的に調節する.
  • LPCは,NSFとATPと組み合わせて,SNARE複合体のベータシート二次構造の破壊を促進し,SNAREの分解のための脂質媒介メカニズムを示唆しています.
  • これらの発見は,SNARE複合体の機能と膜融合調節の制御における脂質マイクロ環境の重要性を強調しています.