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相关概念视频

Overview of Myosin Structure and Function01:15

Overview of Myosin Structure and Function

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Myosins are a family of molecular motor proteins, first identified in the skeletal muscles, where they are responsible for muscle contraction. Along with their role in muscle contraction, these proteins also play a role in the intracellular transport of molecules and vesicles. There are twenty-four classes of myosins based on their domain sequence and organization. Of the twenty-four, six classes (Myosin I, Myosin II, Myosin V, Myosin VI, Myosin VII, and Myosin X)  have been well...
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Conservation of Protein Domains Over Different Proteins02:26

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Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
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Desmosomes01:05

Desmosomes

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The term desmosome derives from the Greek words "desmo" and "soma" meaning "adhesion bodies." This structure was first observed during the late 1800s and described as small, dense nodules in the epidermis. Desmosomes are button-like structures that help form an interlinked network of intermediate filaments across the cells. These junctions are  essential to hold cells together under mechanical stress and to maintain tissue integrity. Desmosomes are multi-protein...
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The Structure of Intermediate Filaments01:19

The Structure of Intermediate Filaments

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The intermediate filaments are one of three widely studied cytoskeletal filaments. They are so named as their diameter (10 nm) is in between that of microfilaments (7 nm) and the microtubules (25 nm).  These filaments are highly stable and can remain intact when exposed to high salt concentrations and detergents. These filaments are responsible for providing stability and mechanical support to the cells. They also help in cell adhesion and maintaining tissue integrity.
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The Sarcomere01:08

The Sarcomere

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A sarcomere is a microscopic segment repeating in a myofibril. The sarcomere fundamentally consists of two main myofilaments: thick filaments called myosin and thin filaments called actin. These filaments interact by sliding past each other in response to stimulus. In addition to myosin and actin, several other proteins, such as tropomyosin, troponin, titin, nebulin, myomesin, α-actinin, and dystrophin, play crucial roles in regulating, structuring, and functioning of the sarcomere.
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Pinching-off of Coated Vesicles01:32

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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...
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相关实验视频

Updated: Jun 28, 2025

Sedimentation Equilibrium of a Small Oligomer-forming Membrane Protein: Effect of Histidine Protonation on Pentameric Stability
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解开德斯明的头部域结构和功能

Dimitrios Vlachakis1, Konstantinos Tsilafakis2,3, Ioanna Kostavasili2

  • 1Biotechnology Department, Agricultural University of Athens, 11855 Athens, Greece.

Cells
|April 12, 2024
PubMed
概括

研究人员确定了Desmin的存在.

关键词:
在NDUFS2中,这里是Desmin的位置.同一性建模的同样性建模.蛋白质相互作用 蛋白质相互作用如果在 D 中

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Using Scaffold Liposomes to Reconstitute Lipid-proximal Protein-protein Interactions In Vitro
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Production of Disulfide-stabilized Transmembrane Peptide Complexes for Structural Studies
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科学领域:

  • 肌肉生物学 肌肉生物学
  • 细胞生物学 细胞生物学
  • 蛋白质相互作用 蛋白质相互作用

背景情况:

  • 介质纤维 (IFs) 具有组织特异性表达,在脊椎动物中有超过70个相关的IF基因.
  • 德斯敏是一种中间丝蛋白,在肌细胞中具有特定的表达.
  • 了解desmin的肌肉特异性行为对于阐明其功能和相关疾病至关重要.

研究的目的:

  • 使用酵母两混合系统识别德斯明的头部结合伙伴.
  • 阐明肌肉特异性行为和肌肉减小的功能.
  • 调查德斯在线粒体和溶酶体功能中的作用.

主要方法:

  • 酵母两混合系统用于识别蛋白质相互作用.
  • 在分析用于原子级相互作用建模.
  • GST拉下测试用于验证蛋白相互作用.

主要成果:

  • 确定了NADH泛氨酸氧化还原酶核心亚单元S2 (NDUFS2) 和saosin D作为直接的desmin结合伙伴.
  • 在分析中发现了一种保存的结合机制,涉及一个三螺旋束与疏水和键相互作用.
  • GST下拉试验证实了这些相互作用需要desmin头部域的必要性.

结论:

  • 德斯直接与线粒体 (NDUFS2) 和 lysosomal (saposin D) 蛋白质相互作用.
  • 德斯敏头域在线粒体和溶解体的功能中起着重要作用.
  • 这些发现提供了对德斯敏相关肌肉病变背后的分子机制的见解.