相关实验视频
Updated: Jul 10, 2025

08:57
Aip1p Dynamics Are Altered by the R256H Mutation in Actin
Published on: July 30, 2014
8.0K
热波和TPM3中与肌肉病相关的突变抑制了可菲林-2诱导的薄丝脱聚合
Katarzyna Robaszkiewicz1, Julia Wróbel1, Joanna Moraczewska1
1Department of Biochemistry and Cell Biology, Faculty of Biological Sciences, Kazimierz Wielki University in Bydgoszcz, 85-671 Bydgoszcz, Poland.
International journal of molecular sciences
|November 25, 2023
概括
肌肉病引起的热粒素变体损害了由cofilin-2进行的actin线条调节. 在Tpm3.12中的p.R91C变体更强烈地抑制了cofilin-2的作用.
科学领域:
- 肌肉生理学 肌肉生理学
- 分子生物学分子生物学
- 生物化学 生化学
背景情况:
- 同步的骨肌收缩依赖于统一的丝长度.
- 与特罗波米奥辛 (Tpm) 基因突变相关的肌肉病常常表现出不规则的细细丝,这表明行为长度维护中的缺陷.
- Tpm3.12是一种对慢肌纤维至关重要的热胺异型.
研究的目的:
- 调查Tpm3.12中肌肉病相关的p.R91C变异对由cofilin-2.2调节活性丝的影响.
- 确定热素如何影响Tpm3.12,cofilin-2和actin纤维之间的相互作用.
主要方法:
- 在Tpm3.12及其p.R91C变体的存在下,研究了cofilin-2与F-actin的结合亲和力.
- 评估了cofilin-2和对Tpm变体结合actin纤维的影响.
- 研究了素 (含有或不含Ca2+) 对Tpm-actin-cofilin-2相互作用和cofilin-2的actin切断/脱聚合活性的影响.
主要成果:
- Tpm3.12及其p.R91C变体并没有改变cofilin-2的F-actin亲和力,但热素增加了它.
- 高度的cofilin-2将Tpm变种从actin中取代,p.R91C显示出更大的抵抗力.
- 这两种Tpm变体都抑制了cofilin-2的actin切断和脱聚合,而p.R91C变体表现出更强大的抑制,表明actin周转率受损. 特罗邦尼进一步抑制了这种活性,但并没有取消它.
结论:
- Tpm3.12的p.R91C变体损害了cofilin-2-介导的氨酸丝周转率,可能导致肌肉病变.
- Tpm变体可以抵抗cofilin-2诱导的脱聚合,而热进一步调节这些相互作用.
- 了解这些分子机制对于开发治疗特罗波米奥辛相关肌肉病变的治疗策略至关重要.
相关概念视频
Actin Filament Depolymerization
3.1K
Actin filaments (F-actin) are composed of actin subunits. The dissociation of actin monomers can occur from either end of F-actin. The rate of dissociation is faster from the minus-end or the pointed end, where the actin subunits exist with a bound ADP, together known as ADP-actin. The depolymerization of F-actin is aided by proteins, including the actin-depolymerizing factor (ADF) and cofilin family of proteins, gelsolin, and glia maturation factor (GMF).
In F-actin, the ADF/cofilin proteins...
In F-actin, the ADF/cofilin proteins...
3.1K
Destabilization of Microtubules
2.7K
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...
2.7K
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
The Sarcomere
8.1K
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.
Each...
Each...
8.1K
Actin Polymerization and Cell Motility
5.3K
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....
5.3K
Disassembly of Intermediate Filaments
2.1K
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...
2.1K

