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関連する概念動画

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.
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...
Asymmetric Lipid Bilayer01:35

Asymmetric Lipid Bilayer

Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
Detergent Purification of Membrane Proteins01:18

Detergent Purification of Membrane Proteins

Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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...

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関連する実験動画

Updated: May 8, 2026

Isolation of Cellular Lipid Droplets: Two Purification Techniques Starting from Yeast Cells and Human Placentas
09:41

Isolation of Cellular Lipid Droplets: Two Purification Techniques Starting from Yeast Cells and Human Placentas

Published on: April 1, 2014

イオンタンパク質と脂質の相互作用によって膜タンパク質を隔離する.

Geert van den Bogaart1, Karsten Meyenberg, H Jelger Risselada

  • 1Department of Neurobiology, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany.

Nature
|October 25, 2011
PubMed
まとめ

神経細胞のエクソサイトーシスに不可欠なシンタキシン-1Aのクラスタリングは,フォスファディチル・イノシトール-4,5-ビスホスファート (PIP2) との静電相互作用によって引き起こされます. この相互作用は,シナプス水泡の放出に不可欠な独特の膜マイクロドメインを形成します.

さらに関連する動画

Isolation of Lipoprotein Particles from Chicken Egg Yolk for the Study of Bacterial Pathogen Fatty Acid Incorporation into Membrane Phospholipids
11:59

Isolation of Lipoprotein Particles from Chicken Egg Yolk for the Study of Bacterial Pathogen Fatty Acid Incorporation into Membrane Phospholipids

Published on: May 15, 2019

Mechanical Separation and Protein Solubilization of the Outer and Inner Perivitelline Sublayers from Hen's Eggs
06:12

Mechanical Separation and Protein Solubilization of the Outer and Inner Perivitelline Sublayers from Hen's Eggs

Published on: January 27, 2021

関連する実験動画

Last Updated: May 8, 2026

Isolation of Cellular Lipid Droplets: Two Purification Techniques Starting from Yeast Cells and Human Placentas
09:41

Isolation of Cellular Lipid Droplets: Two Purification Techniques Starting from Yeast Cells and Human Placentas

Published on: April 1, 2014

Isolation of Lipoprotein Particles from Chicken Egg Yolk for the Study of Bacterial Pathogen Fatty Acid Incorporation into Membrane Phospholipids
11:59

Isolation of Lipoprotein Particles from Chicken Egg Yolk for the Study of Bacterial Pathogen Fatty Acid Incorporation into Membrane Phospholipids

Published on: May 15, 2019

Mechanical Separation and Protein Solubilization of the Outer and Inner Perivitelline Sublayers from Hen's Eggs
06:12

Mechanical Separation and Protein Solubilization of the Outer and Inner Perivitelline Sublayers from Hen's Eggs

Published on: January 27, 2021

科学分野:

  • 細胞生物学 細胞生物学
  • 神経科学は神経科学である.
  • バイオケミストリー バイオケミストリー

背景:

  • ニューロンのエクソサイトーシス,すなわちシナプス胞の放出プロセスは,シンタキシン-1A.のようなタンパク質によって調節されます.
  • シンタキシン-1Aは,エクソサイトーシスの部位でプラズマ膜に集結するが,その結合のメカニズムは不明のままである.

研究 の 目的:

  • プラズマ膜におけるシンタキシン-1Aの結合とクラスタリングの背後にあるメカニズムを解明する.
  • シンタキシン-1Aマイクロドメイン形成における特定の脂質の役割を調査する.

主な方法:

  • PC12細胞における超解像度刺激放出減退 (STED) 顕微鏡.
  • 脂質操作とタンパク質再構成を含む生化学的測定法.
  • 人工膜系における脂質とタンパク質の相互作用の分析 (巨大な単一メーラー膀).

主要な成果:

  • フォスファディチルイノシトール-4,5-ビスホスファート (PIP2) は,シンタキシン-1A濃縮マイクロドメインにおける支配的なアニオン性脂質として特定されました.
  • PIP2の蓄積はシンタキシン-1Aのクラスタリングに不可欠であり,シナプトジャニン-1による降解はクラスタリングを減少させた.
  • シンタキシン-1AとPIP2は,コレステロールから独立して,再構成された膀で異なるドメインに分離されます.

結論:

  • シンタキシン-1AとPIP2の間の静電相互作用は,特定のプラズマ膜マイクロドメインの形成を促します.
  • これらのPIP2を媒介するマイクロドメインは,シンタキシン-1Aの局所化とニューロンのエクソサイトーシスにおける機能に不可欠である.
  • タンパク質-脂質の電気静的相互作用は,コレステロールや他の脂質相行動から独立して膜ドメインを形成することができます.