通过脂质双层化合物的组合对水蛋白动态的功能调节
Anh T P Nguyen1, Austin T Weigle2, Diwakar Shukla1,3,4,5
1Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, IL 61801.
bioRxiv : the preprint server for biology
|July 28, 2023
概括
膜蛋白的行为受到周围的脂质双层的显著影响. 仔细选择脂质双层对于精确的分子动力学模拟膜蛋白如水蛋白至关重要.
科学领域:
- 生物物理学的生物物理.
- 计算生物学 计算生物学
- 膜蛋白研究研究 膜蛋白研究
背景情况:
- 膜蛋白的功能与周围的脂质环境密切相关.
- 脂质双层组成对膜蛋白动态的影响往往被忽视.
- 植物水素SoPIP2;1缺乏之前报告的高亲和性脂质相互作用.
研究的目的:
- 为了研究不同脂质双层组成对植物水族素SoPIP2的影响;1.1.
- 描述膜嵌入如何影响SoPIP2;1结构,热力学,动力学和水运输.
- 为在膜蛋白模拟中选择适当的脂质双层提供指导方针.
主要方法:
- 用分子动力学模拟来研究SoPIP2;1.1.
- 为了比较,使用了一个现实的脂质双层和九个均的双层.
- 分析包括结构,热力学和运动性质,以及水运输速率.
- 疏水不匹配和脂质顺序参数被计算出来,以解释观察到的行为.
主要成果:
- SoPIP2;1的结构,热力学,动力学和水运输受到脂质双层环境的显著改变.
- 一个现实的脂质双层稳定了SoPIP2的非功能性转移稳定状态;1.1.
- 脂质双层特性,如疏水不匹配和顺序参数,已被证明可以调节SoPIP2;1的行为.
- 模拟揭示了同质与现实的脂质双层对水蛋白功能的明显影响.
结论:
- 脂质双层选择是影响膜蛋白动态和功能的关键因素.
- 由于脂质环境的重大影响,目前的模拟实践可能需要重新评估.
- 研究人员在为膜蛋白分子动力学模拟选择脂质双层时应谨慎.
相关概念视频
Aquaporins
4.9K
Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
4.9K
Membrane Fluidity
153.0K
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.
153.0K
Protein Diffusion in the Membrane
4.4K
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...
4.4K
Asymmetric Lipid Bilayer
7.3K
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%...
7.3K
Fluid Mosaic Model
12.0K
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...
12.0K
Membrane Domains
5.5K
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...
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...
5.5K


