通过omega-6和omega-9脂肪酸异常的膜组织
Sudha Porte1,2, Swaratmika Pandia3, Ankita Joardar3
1CSIR-National Chemical Laboratory, Dr Homi Bhabha Road, Pune 411 008, India. d.sengupta@ncl.res.in.
Physical chemistry chemical physics : PCCP
|March 7, 2025
概括
欧米茄-6和欧米茄-9脂肪酸根据它们的质子化状态不同地影响细胞膜. 质子烯酸命令膜,而质子烯酸破坏它们,挑战现有的理论.
科学领域:
- 生物化学 生物化学
- 分子生物物理学 分子生物物理学
- 膜生物学 膜生物学
背景情况:
- 欧米茄脂肪酸是作为具有潜在健康益处的补充剂销售的.
- 他们提出的机制涉及膜重组和脂质-蛋白质相互作用的调制.
- 关于它们对膜结构的特定影响,在分子水平上只有有限的理解.
研究的目的:
- 研究omega-6 (酸) 和omega-9 (油酸) 对脂质膜组织的分子作用.
- 阐明脂肪酸质子化状态在膜相互作用中的作用.
- 为了全面理解,比较实验和基于模拟的发现.
主要方法:
- 利用光谱学和全原子分子动力学模拟的结合方法.
- 分析了利诺基酸和酸的质子化和脱质子化形式对膜结构的影响.
- 测量了膜染料的脂质顺序参数和旋转相关时间.
主要成果:
- 脂肪酸的影响对它们的质子化状态敏感.
- 质子烯酸 (欧米茄-6) 增加了膜排序,与基于不和的预期相反.
- 质子化油酸 (欧米茄-9) 破坏了膜的秩序,而脱质子化油酸则调整了膜核心.
- 脱联酸破坏了膜核心.
- 旋转自相关函数与实验测量保持一致,捕捉脂质顺序参数错过的微妙效应.
结论:
- 质子化状态极大地影响欧米茄脂肪酸如何影响膜组织.
- 这些发现挑战了简单的观点,即链不和仅仅决定了膜乱.
- 结合实验和模拟方法对于准确的分子洞察脂肪酸-膜相互作用至关重要.
更多相关视频
11:44Metabolic Labeling and Membrane Fractionation for Comparative Proteomic Analysis of Arabidopsis thaliana Suspension Cell Cultures
Published on: September 28, 2013
14.0K
07:49Spontaneous Formation and Rearrangement of Artificial Lipid Nanotube Networks as a Bottom-Up Model for Endoplasmic Reticulum
Published on: January 22, 2019
7.8K
相关概念视频
Asymmetric Lipid Bilayer
7.1K
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%...
7.1K
Fluid Mosaic Model
11.3K
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...
11.3K
Membrane Fluidity
10.9K
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...
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...
10.9K
Membrane Domains
5.3K
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...
5.3K
Mechanisms of Membrane Domain Formation
2.9K
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...
Another mechanism for membrane domain formation involves membrane proteins interacting with...
2.9K
Membrane Lipids
21.1K
Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
21.1K
