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相关概念视频

Aquaporins01:25

Aquaporins

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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.
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Fluid Mosaic Model01:19

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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...
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Asymmetric Lipid Bilayer01:35

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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%...
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Multi-pass Transmembrane Proteins and β-barrels01:09

Multi-pass Transmembrane Proteins and β-barrels

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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...
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Single-pass Transmembrane Proteins01:25

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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...
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Membrane Fluidity01:26

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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
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相关实验视频

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Automated Lipid Bilayer Membrane Formation Using a Polydimethylsiloxane Thin Film
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水双层作为不透水的蛋白质膜.

Friederike Nolle1, Leonhard J Starke2, Alessandra Griffo1,3,4

  • 1Department of Experimental Physics, Saarland University, D-66123 Saarbrücken, Germany.

Langmuir : the ACS journal of surfaces and colloids
|September 19, 2023
PubMed
概括

纯蛋白质膜由水蛋白HFBI制成,具有极低的水透性,在稳定性和透压力抵抗性方面超过脂质膜. 这表明基于蛋白质的屏障在诸如海水淡化等领域具有新的应用.

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科学领域:

  • 生物物理学的生物物理.
  • 材料科学 材料科学 材料科学
  • 生物化学 生物化学

背景情况:

  • 膜透性对于控制分子运输至关重要.
  • 对于稳定的药物输送囊泡来说,低水透性是可取的.
  • 水蛋白是两性蛋白质,具有潜在的膜形成能力.

研究的目的:

  • 为了研究由水蛋白HFBI形成的纯蛋白质膜的透性.
  • 为了比较HFBI膜与脂质膜的稳定性和透压力阻力.
  • 阐明HFBI双层接近零的水透性背后的分子机制.

主要方法:

  • 滴滴界面双层 (DIB) 技术以形成HFBI双层.
  • 奥斯摩斯压力实验,以评估膜的稳定性.
  • 全原子分子动力学 (MD) 模拟以建模HFBI双层结构和透性.

主要成果:

  • HFBI双层显示出异常低的水透性,基本上对水无透.
  • 与传统的脂质膜相比,HFBI双层能够承受更高的透压力.
  • MD模拟排除了蜂,油层或类似脂质的混乱包装作为低透性的解释.

结论:

  • HFBI蛋白质膜提供了一个高度稳定的,低透性的屏障,与脂质膜不同.
  • HFBI蛋白质的独特结构和包装是它们近于零的水透率的原因.
  • HFBI膜在需要不敏感于透压的应用中表现有前途,例如先进的海水淡化技术.