在脂质双层膜中研究KCNE3跨膜域的 conformational 属性,使用分子动力学模拟
Anna Clara Miranda Moura1, Isaac K Asare1, Mateo Fernandez Cruz1
1Natural Science Division, Campbellsville University, Campbellsville, KY 42718, USA.
Membranes
|February 23, 2024
概括
KCNE3 在线阅读
科学领域:
- 分子生物物理学 分子生物物理学
- 膜蛋白的动力学 膜蛋白的动力学
- 离子通道规则 离子通道规则
背景情况:
- KCNE3是一种单通道的整体膜蛋白,对电压通道功能至关重要.
- 之前的研究表明,KCNE3的跨膜域 (TMD) 具有曲的α螺旋结构.
- 在原生脂质二层中,KCNE3的精确构造特性仍然不太清楚.
研究的目的:
- 在现实的脂质双层环境中研究KCNE3跨膜域 (TMD) 的结构动态.
- 检查影响相互作用损害突变对KCNE3TMD形状的影响.
- 提供分子洞察力,补充KCNE3.3的实验发现.
主要方法:
- 采用了全原子分子动力学 (MD) 模拟.
- 在一个由POPC和POPG (3:1) 组成的脂质双层中进行了模拟.
- 分析了特定突变 (V72A,I76A,F68A) 的影响.
主要成果:
- 在KCNE3 TMD采用近线性阿尔法螺旋结构在POPC-POPG双层.
- 影响相互作用的突变在模拟时间框架内没有显著改变α-螺旋形状.
- 与其N和C端相比,KCNE3 TMD表现出更高的稳定性和更低的灵活性.
结论:
- KCNE3的跨膜域在脂质双层中采用线性α-螺旋形状.
- 影响KCNE3-KCNQ1相互作用的突变对TMD结构的影响有限.
- MD模拟为KCNE3在类似本地环境中的结构动态提供了有价值的见解.
相关概念视频
Multi-pass Transmembrane Proteins and β-barrels
5.3K
In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as...
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as...
5.3K
Single-pass Transmembrane Proteins
5.0K
Integral membrane proteins are tightly associated with the cell membrane and play a crucial role in cell communication, signaling, adhesion, and transport of the molecules. Some integral membrane proteins are present only in the membrane monolayer. For example, the enzyme fatty acid amide hydrolase is present in the cytoplasmic side of the membrane monolayer. In contrast, another type of integral membrane protein, also known as a transmembrane protein, spans across the membrane. Transmembrane...
5.0K
Insertion of Multi-pass Transmembrane Proteins in the RER
8.0K
The rough ER membrane synthesizes, assembles, and embeds transmembrane proteins in diverse topologies. These proteins function as transporters or channels and can remain in the ER membrane or are sent to the Golgi complex, lysosome, and cell membrane.
The multipass transmembrane proteins are the type IV integral membrane proteins with multiple topogenic sequences determining their spatial arrangement in the ER membrane. Nearly all multipass proteins lack a cleavable signal sequence and use...
The multipass transmembrane proteins are the type IV integral membrane proteins with multiple topogenic sequences determining their spatial arrangement in the ER membrane. Nearly all multipass proteins lack a cleavable signal sequence and use...
8.0K
Insertion of Single-pass Transmembrane Proteins in the RER
6.7K
Integral membrane proteins are proteins adhered to the lipid bilayer of a cell organelle or membrane. They can be of two types: transmembrane integral proteins that span the lipid bilayer and monotopic proteins that are attached to either side of the membrane but do not pass through it.
Integral transmembrane proteins possess transmembrane and extra membrane domains. The transmembrane domains are primarily made of 20-25 hydrophobic amino acids arranged in a helical secondary confirmation. These...
Integral transmembrane proteins possess transmembrane and extra membrane domains. The transmembrane domains are primarily made of 20-25 hydrophobic amino acids arranged in a helical secondary confirmation. These...
6.7K
Mechanisms of Membrane-bending
2.7K
The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
2.7K
Membrane Fluidity
11.2K
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...
11.2K


