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相关概念视频

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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膜脂质影响蛋白质复合体的组装-拆卸.

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
概括
此摘要是机器生成的。

与L-α-lysophosphatidylcholine (LPC) 囊泡相比,与胆固醇相关的囊泡产生较小的t-/v-SNARE环复合体. 此外,LPC还促进了这些复合体中的β-sheet结构的N-乙基胺胺敏感因子+腺三酸盐诱导的分解.

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科学领域:

  • 生物化学 生物化学
  • 分子生物学分子生物学
  • 生物物理学的生物物理.

背景情况:

  • 可溶性NSF附着蛋白受体 (SNAREs) 介导膜融合,这是细胞运输中的一个关键过程.
  • 控制SNARE复合体组装和拆卸的精确结构机制和脂质相互作用仍然不完全理解.
  • 了解SNARE复杂的动态对于破译细胞内贩运通路至关重要.

研究的目的:

  • 研究不同脂质,特别是胆固醇和L-α-lysophosphatidylcholine (LPC) 对t-/v-SNARE复合物的结构性质的影响.
  • 阐明N-乙烯胺胺敏感因子 (NSF) 和腺三酸盐 (ATP) 在不同脂质环境的存在下调节SNARE复合结构中的作用.

主要方法:

  • 使用原子力显微镜 (AFM) 测量了与胆固醇相关囊泡形成的t-/v-SNARE环复合体的大小,而不是含有LPC的囊泡.
  • 循环二元化 (CD) 光谱法被用来分析不同条件下的t-/v-SNARE复合体内的二次结构变化 (β-片和α-螺旋内容).

主要成果:

  • 与胆固醇相关囊泡形成的t-/v-SNARE环复合体大约比含有LPC囊泡形成的较小11%.
  • CD光谱学显示,在LPC的存在下,NSF+ATP诱导了t-/v-SNARE复合体内的β片结构的显著分解.
  • 在LPC的存在下,t-/v-SNARE复合物的α-螺旋内容在很大程度上不受NSF+ATP的影响.

结论:

  • 胆固醇和LPC不同调节t-/v-SNARE复合物的大小和结构完整性.
  • 与NSF和ATP结合,LPC促进了SNARE复合体中的β-sheet二次结构的破坏,这表明SNARE分解的脂质介导机制.
  • 这些发现强调了脂质微环境在控制SNARE复合体功能和膜融合调节方面的重要性.