通过将SMALP封装在表面活性剂稳定液滴中,形成脂质囊泡
Jorik Waeterschoot1, Marta Barniol-Xicota2, Steven Verhelst3
1Biomimetics Group, Division of Mechatronics, Biostatistics and Sensors (MeBios), Department of Biosystems, KU Leuven, Willem de Croylaan 42, 3001 Leuven, Belgium.
Heliyon
|September 30, 2024
概括
研究人员开发了一种新方法,用烯酸脂质颗粒 (SMALP) 来制造巨型单囊 (GUV). 这种技术为在简化,类似细胞的环境中研究膜蛋白提供了一个有前途的途径.
科学领域:
- 细胞生物学 细胞生物学
- 生物物理学的生物物理.
- 药物发现 药物发现 药物发现
背景情况:
- 了解膜蛋白的功能对于细胞生物学和药物发现至关重要.
- 在缩小的背景下研究复杂的细胞膜是必不可少的.
- 将膜蛋白重组成像巨型单囊 (GUVs) 这样的细胞模拟环境具有挑战性,通常需要可以损害蛋白质功能的洗剂.
研究的目的:
- 以表面活性剂稳定液滴作为模板,从 styrene maleic acid脂质颗粒 (SMALPs) 制造GUV的新策略.
- 专注于将纯脂质SMALP转化为GUV,作为未来膜蛋白结合的基本步骤.
- 评估新成立的GUVs的有效性和特征.
主要方法:
- 使用表面活性剂稳定液滴作为GUV形成的模板.
- 用于囊泡合成的氨酸脂颗粒 (SMALP).
- 开发了一种标有光素的SMA (FSMA),以帮助方法评估.
- 应用了共聚焦光显微镜,光素泄漏测定和冷传输电子显微镜 (cryo-TEM) 进行表征.
主要成果:
- 成功演示了SMALP在表面活性剂稳定液滴的接口上的组装.
- 在添加脱剂后实现了GUV形成.
- 观察到,由此产生的GUV,虽然在视觉上类似于电形囊泡,但表现出多孔性质.
- 确定了SMA与脂质双层之间的潜在残留相互作用,作为囊泡多孔性的原因.
结论:
- 开发的方法为从SMALP中生成GUV提供了一个新的策略.
- 这种方法代表了在为膜蛋白研究创建复杂性降低,生物相关系统方面取得的重大进展.
- 可能需要进一步优化来解决观察到的多孔性,并完全模仿本地膜环境.
相关概念视频
Intralumenal Vesicles and Multivesicular Bodies
3.4K
Intraluminal vesicles (ILVs) are small vesicles 50-80 nm in diameter formed during the maturation of early endosomes. A specialized endosome containing numerous ILVs is called a multivesicular body (MVB). ILVs contain internalized molecules such as antigens, nucleic acids, proteins, and metabolites. Some of these molecules are released from the MVBs inside exosomes and are transported to other cells. Other MVBs contain molecules that are retained in the ILVs and are later degraded within the...
3.4K
Pinching-off of Coated Vesicles
3.1K
Vesicle budding is orchestrated by distinct cytosolic proteins such as adaptor proteins, coat proteins, and GTPases. To initiate vesicle budding, membrane-bending proteins containing crescent-shaped BAR domains bind to the lipid heads in the bilayer and distort the membrane to form a protein-coated vesicle bud. Adaptors proteins such as AP2 for clathrin-coated vesicles can nucleate on the deformed membrane. Finally, coat proteins such as clathrin or COPI and COPII assemble into a coat forming...
3.1K
Clathrin Coated Vesicles
6.9K
Clathrin-coated vesicles use endocytosis to transport receptors and lysosomal hydrolases from the Golgi to the lysosome in the late secretory pathway. Clathrin-mediated endocytosis was the first described endocytic process, and Clathrin-coated vesicles remain one of the most well-studied transport vesicles. The molecular machinery that generates clathrin-coated vesicles comprises over 50 proteins that precisely coordinate vesicle formation. Cell surface receptors concentrated in indented sites...
6.9K
SNAREs and Membrane Fusion
10.8K
Once a transport vesicle has recognized its target organelle, the vesicular membrane needs to fuse with the target membrane to unload the cargo. Transmembrane proteins called SNAREs present on organelle membranes and their vesicles, mediate vesicle fusion.
SNAREs exist in pairs that symmetrically interact and catalyze the fusion of the lipid bilayers in vesicle and target organelle. v-SNARE in the vesicle membrane are single polypeptide chains that bind to a complementary t-SNARE, composed of 2...
SNAREs exist in pairs that symmetrically interact and catalyze the fusion of the lipid bilayers in vesicle and target organelle. v-SNARE in the vesicle membrane are single polypeptide chains that bind to a complementary t-SNARE, composed of 2...
10.8K
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
Mechanisms of Membrane Domain Formation
3.0K
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...
3.0K


