相关实验视频
Updated: Jul 3, 2026

10:34
Ligand Nano-cluster Arrays in a Supported Lipid Bilayer
Published on: April 23, 2017
跨越长度尺度的桥梁:通过脂蛋白自我组装和表面图案的支持脂质双层的多尺度排序
Madhuri S Vinchurkar1, Daniel A Bricarello, Jens O Lagerstedt
1Department of Applied Science, University of California, Davis, California 95616, USA.
Journal of the American Chemical Society
|July 23, 2008
概括
研究人员开发了一种两步方法,以创建有图案的脂质双层. 这种技术可以精确控制纳米级和大尺度结构,使高密度膜蛋白阵列用于高级研究.
科学领域:
- 生物物理学的生物物理.
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
背景情况:
- 支持的脂质双层对于研究膜蛋白功能至关重要.
- 目前的脂质二层模式的方法缺乏对多个长度尺度的精确控制.
- 重建的高密度脂蛋白 (rHDL) 颗粒提供了一个创建纳米结构脂质组件的平台.
研究的目的:
- 开发一种新的两步过程,用于创建有图案的单一,支持的脂质双层.
- 为了实现对脂质双层的纳米级和中视尺度图案的独立控制.
- 为了使高密度膜蛋白阵列的生成用于结构功能研究.
主要方法:
- 脂质和阿波利波蛋白 (阿波利波蛋白A-I) 自发自组,形成rHDL颗粒.
- 通过对水友表面上吸收的rHDL颗粒的紫外线辐射暴露而形成的表面图案.
- 使用水友性/疏水性表面指导rHDL吸附和双层形成的化学图案.
- 边界蛋白质的选择性变性,以消除纳米尺度的分离.
主要成果:
- 成功地产生了单一的,支持的脂质双层,在纳米尺度和中视尺度的长度尺度上都有图案.
- 通过控制自组装和表面图案,证明了两种长度尺度的独立调节性.
- 通过利用rHDL在有图案的表面上的差异吸附,创造了新的组成模式.
- 展示了选择性地去除纳米尺度特征的能力,留下半透镜图案流体双层.
结论:
- 开发的两步过程为制造纳米结构脂质双层微阵列提供了一个多功能平台.
- 这种方法促进了膜蛋白在定义的纳米级隔间内嵌入.
- 该系统提供了一种可行的方法来生成高密度膜蛋白质阵列,这对于阐明结构功能关系和脂质动态至关重要.
相关概念视频
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...
Another mechanism for membrane domain formation involves membrane proteins interacting with cytoskeletal...
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%...
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...
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 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...
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 Domains
The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the anterior...
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the anterior...
Fluid Mosaic Model
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 with the analogy of...

