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相关概念视频

Protein Folding01:22

Protein Folding

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Overview
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Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

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The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
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Introduction to Membrane Proteins01:16

Introduction to Membrane Proteins

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The cell membrane, or plasma membrane, is an ever-changing landscape. It is described as a fluid mosaic where various macromolecules are embedded in the phospholipid bilayer. Among the macromolecules are proteins. The protein content varies across cell types. For example, mitochondrial inner membranes contain ~76% protein content, while myelin contains ~18% protein content. Individual cells contain many types of membrane proteins—red blood cells contain over 50—and different cell...
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Mechanisms of Membrane-bending01:15

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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...
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Protein Folding Quality Check in the RER01:29

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ER is the primary site for the maturation and folding of soluble and transmembrane secretory proteins. The calnexin cycle is a specific chaperone system that folds and assesses the confirmation of N-glycosylated proteins before they can exit the ER lumen. The primary players of this quality check pipeline are the lectins, ER-resident chaperones, and a glucosyl transferase enzyme. In case the calnexin system in the lumen fails to salvage a misfolded protein, it is transported to the cytoplasm...
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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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Thermodynamics of Membrane Protein Folding Measured by Fluorescence Spectroscopy
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膜蛋白折叠路径中的新兴模式

Sang Ah Kim1, Hyun Gyu Kim1, W C Bhashini Wijesinghe2

  • 1School of Biological Sciences and Institute of Molecular Biology and Genetics, Seoul National University, Seoul, South Korea;

Annual review of biophysics
|May 6, 2025
PubMed
概括
此摘要是机器生成的。

膜蛋白通过由脂质二层和进化权衡影响的复杂途径折叠. 技术的进步允许对这些过程进行详细的研究,揭示了序列优化如何平衡功能和可折叠性.

关键词:
螺旋式头发针螺旋式头发针膜蛋白的折叠 膜蛋白的折叠多域膜蛋白质是多域膜蛋白质.单分子力光谱法 单分子力光谱法有模板的折叠式

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科学领域:

  • 生物化学 生物化学
  • 分子生物学分子生物学
  • 结构生物学 结构生物学

背景情况:

  • 膜蛋白折叠研究已经从简单的系统发展到复杂的系统.
  • 新技术允许高分辨率检查折叠路径.

研究的目的:

  • 探索控制膜蛋白折叠的生物物理约束和进化策略.
  • 了解序列优化如何平衡功能和可折叠性.

主要方法:

  • 单分子力光谱学 单分子力光谱学
  • 在体内强力分析 (in vivo force profiling) 进行.
  • 分析膜蛋白序列中的进化策略.

主要成果:

  • 膜蛋白折叠受到脂质双层粘度和降低TM螺旋体水性的限制.
  • 折叠通常以螺旋式针头的形式发生,在急救护理人员的协助下.
  • 多域蛋白质表现出性网络,影响跨域的折叠.

结论:

  • 进化策略,如域专业化,优化了膜蛋白的折叠性,稳定性和功能.
  • 尽管存在生物物理上的挑战,但膜蛋白序列是微调的,以获得最佳的性能.