致病突变对活细胞中高序列二胺组合的形成的影响
Per Niklas Hedde1,2,3, Songning Zhu3, Barbara Barylko4
1Beckman Laser Institute and Medical Clinic, University of California, Irvine, California 92697, United States.
Biochemistry
|October 11, 2024
概括
动氨酸2 (DNM2) 突变导致查洛-玛丽-牙 (CMT) 和中心核肌病 (CNM). 无论是DNM2突变还是CNM相关突变,都会形成更大的膜结构,但CNM突变会导致更严重的功能获取效应.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 神经科学是一个神经科学.
背景情况:
- 动氨酸2 (DNM2) 的突变与Charcot-Marie-Tooth (CMT) 神经病变和中心核肌病变 (CNM) 有关.
- 这些突变通常发生在普莱克斯特林同质域 (PHD),影响动氨酸自我组装和GTPase活性.
- CNM突变破坏了分子内相互作用,而CMT突变则靠近氨酸化物结合表面.
研究的目的:
- 调查CMT和CNM相关的DNM2突变的独特致病机制.
- 为了比较CMT相关突变 (ΔDEE) 与CNM相关突变 (A618T) 对动氨酸2结构和功能的影响.
主要方法:
- 对野生型DNM2 (DNM2WT),一种CMT相关突变 (DNM2ΔDEE) 和一种CNM相关突变 (DNM2A618T) 的比较分析.
- 评估在等离子体膜上的dynamin 2结构的形成.
- 对细胞质内含形成的评估.
主要成果:
- 与DNM2WT相比,DNM2ΔDEE和DNM2A618T突变物在血上形成了更大,更稳定的结构.
- 在低于DNM2WT或DNM2ΔDEE的度下,DNM2A618T (与CNM相关) 诱导了细胞质内含.
- 这些发现表明,CNM突变赋予了更严重的功能增益特性.
结论:
- 在DNM2 PHD中不同的突变位置影响疾病特异性.
- 与CNM相关的DNM2突变比研究的CMT相关突变表现出更明显的功能获取特征.
- 了解这些差异对于破译DNM2相关疾病的病原性至关重要.
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
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
Destabilization of Microtubules
2.6K
The destabilization of microtubules can occur during different stages of the microtubule lifecycle, such as nucleation or elongation. It can take place at either end of the microtubule or in the microtubule lattices as a whole. The lifespan of individual microtubules within a cell varies according to the cell type and stage of the cell cycle. During interphase, the lifespan of the microtubule is about 30 minutes, while during cell division, it is about 15 minutes. In axonal microtubules of...
2.6K
Actin Polymerization and Cell Motility
5.1K
Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate....
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate....
5.1K
Small GTPases - Ras and Rho
3.9K
Ras and Rho are small monomeric GTPases that act downstream of receptor tyrosine kinase (RTK) and regulate various cellular processes. These GTPases switch between active and inactive states by binding to guanine nucleotides.
Three regulatory proteins control their activity:
Three regulatory proteins control their activity:
3.9K
Microtubule Instability
5.0K
Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
5.0K


