相关实验视频
Updated: Jun 12, 2025

10:23
Lipid Droplet Isolation for Quantitative Mass Spectrometry Analysis
Published on: April 17, 2017
10.1K
在脂质滴上以表面张力驱动的人类利平的分类
Ana Rita Dias Araújo1, Abdoul Akim Bello1, Joëlle Bigay1
1Université Côte d'Azur, CNRS and Inserm, Institut de Pharmacologie Moléculaire et Cellulaire, UMR 7275 , Sophia Antipolis, France.
The Journal of cell biology
|September 19, 2024
概括
周周素 (PLINs) 与脂质滴 (LDs) 的相互作用不同. PLIN3和PLIN4结合了应力诱导的LDs,而PLIN1更喜欢脂覆盖的LDs,揭示了适应的结合策略.
科学领域:
- 脂质新陈代谢 脂质新陈代谢
- 细胞生物学 细胞生物学
- 蛋白质-脂质相互作用
背景情况:
- 脂素 (PLINs) 是主要的蛋白质,覆盖脂质滴 (LDs).
- 尽管结构相似,人类的PLIN表现出不同的LD结合偏好.
- 了解这些差异对于脂质液滴生物学至关重要.
研究的目的:
- 研究PLIN与脂质滴的差异性结合机制.
- 阐明表面特性如张力和脂组成如何影响PLIN结合.
- 为了将体外结合行为与体内脂肪细胞局部化相关联.
主要方法:
- 使用了具有定义极性脂质涂层的人工脂质滴.
- 应用过渡变形来诱导人工LDs的表面张力.
- 纯化的PLIN3和PLIN4两螺旋 (AH) 用于结合试验.
- 在受刺激的甘油三合成下,在人类脂肪细胞中观察到PLIN局部化.
主要成果:
- 通过表面张力增强了PLIN3和PLIN4的AH结合,独立于脂成分.
- PLIN1很容易与富含脂的LDs结合,而PLIN2显示中间结合.
- 在脂肪细胞中,PLIN3/4在快速甘油三合成期间迁移到LDs,与PLIN1/2不同,PLIN1/2局部化到现有的LDs.
结论:
- 利平蛋白家族根据表面特性对脂质滴表现出明显的亲和力.
- PLINs适应与表现出不同表面张力和脂覆盖的脂质滴相互作用.
- 这种差异性结合机制允许在细胞内的脂质滴管理中发挥特殊作用.
相关概念视频
Assembly of the Lipid Bilayer in the ER
3.1K
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...
3.1K
Membrane Asymmetry Regulating Transporters
4.3K
Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
4.3K
Membrane Fluidity
11.0K
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...
11.0K
Asymmetric Lipid Bilayer
7.2K
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%...
7.2K
Phosphoinositides and PIPs
8.5K
Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
8.5K
Mechanism of Lamellipodia Formation
2.5K
Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
2.5K

