相关实验视频
Updated: Jun 8, 2025

12:15
In Vitro Polymerization of F-actin on Early Endosomes
Published on: August 28, 2017
9.0K
在体内,VezA/vezatin促进了dynactin复合物的正确组装
Jun Zhang1, Rongde Qiu1, Sean Xie2
1Department of Biochemistry and Molecular Biology, The Uniformed Services University of the Health Sciences - F. Edward Hébert School of Medicine, Bethesda, MD 20814, USA.
Cell reports
|November 2, 2024
概括
维兹A对阿斯伯吉勒斯尼杜兰斯的dynactin组合至关重要,影响细胞内运输. 这项研究揭示了VezA的存在.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 细胞内运输依赖于细胞质二烯,这需要二烯复合体来进行载荷结合和运动激活.
- 控制那克丁复合体组合的细胞机制尚未得到充分理解.
- 迪纳克是一种多元组件复合物,包括p150,p50,和Arp1 (actin相关蛋白1) 迷你丝,具有尖端子复合物.
研究的目的:
- 为了研究涉及到dynactin组装的细胞因素.
- 确定韦萨丁同类物VezA在 Aspergillus nidulans中的 dynactin 组合和功能中的作用.
主要方法:
- 研究了VezA在Aspergillus nidulans中的功能.
- 检查了VezA和Arp1迷你导线之间的物理相互作用.
- 分析了VezA损失对dynactin组件水平 (Arp1,p50,p150) 的影响,使用共免疫沉和西式斑点.
- 研究了各种类型的迪纳克丁突变,以了解组装协调.
主要成果:
- 维兹A对于阿斯伯吉勒斯尼杜兰斯的迪纳克丁组合至关重要.
- 在载荷结合和激活之前,VezA会影响微管 plus-end 积累的dynein.
- VezA与Arp1迷你丝进行物理相互作用,其缺失会降低Arp1,p50和p150的水平.
- 迪纳克的组装是一个高度协调的过程,正如用迪纳克突变体的研究所证明的那样.
结论:
- 维兹A在体内组合的dynactin复合体中起着至关重要的作用.
- 这些发现阐明了dynactin组装调节的新方面.
- 这项研究提供了对控制细胞内运输的细胞机械的洞察.
相关概念视频
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
The Movement of Organelles and Vesicles
4.4K
In eukaryotic cells, cytoskeletal filaments such as actin, microtubules, and intermediate filaments form a mesh-like cytoskeletal network. These filaments serve as tracks for transporting cellular cargo. Specialized motor proteins use the chemical energy stored in adenosine triphosphate (ATP) for this transport. During interphase, microtubules are polarized, with the plus-end towards the cell periphery and the minus-end towards the cell center. Two microtubule-associated motor proteins,...
4.4K
Protein Complex Assembly
10.6K
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
10.6K
Coat Assembly and GTPases
3.5K
Vesicles incorporate different coat protein subunits in different cell locations, which changes the properties of the coat, such as the shape and geometry of the transport vesicles. Thus, vesicle coat proteins also play a significant role in cargo selection.
Coat assembly depends on the local availability of phosphatidylinositol phosphates or PIPs and GTP-binding proteins. Adaptor proteins, which link the coat proteins to the membrane, bind to these PIPs and play a crucial role in controlling...
Coat assembly depends on the local availability of phosphatidylinositol phosphates or PIPs and GTP-binding proteins. Adaptor proteins, which link the coat proteins to the membrane, bind to these PIPs and play a crucial role in controlling...
3.5K
Disassembly of Intermediate Filaments
2.0K
Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
2.0K
Generation of Straight or Branched Actin Filaments
2.9K
The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
2.9K

