脊髓肌肉缩基因产物调节了行为动态
Tobias Schüning1,2, Andre Zeug3, Katharina Strienke1,2
1SMATHERIA gGmbH - Non-Profit Biomedical Research Institute, Hannover, Germany.
概括
脊柱肌肉缩 (SMA) 涉及到低生存的 Motoneuron (SMN) 蛋白质. 这项研究揭示了SMN直接结合actin,独立于profilin2a,影响SMA中的神经元功能.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 脊髓肌肉缩 (SMA) 是一种神经肌肉疾病,与减少Motoneuron (SMN) 蛋白质水平的存活率有关.
- 众所周知,SMN蛋白通过与神经元发育至关重要的profilin2a的相互作用来调节actin动力学.
- 功能性SMN的丧失会扰乱神经元外生和突触形成,但其与actin的直接相互作用尚不清楚.
研究的目的:
- 为了研究SMN蛋白与actin单体 (G-actin) 和聚合物 (F-actin) 之间的直接相互作用.
- 确定SMN对行为动态的调节是否独立于它与profilin2a的相互作用.
- 阐明SMN-actin相互作用在神经元功能中的作用及其在SMA中的失调.
主要方法:
- 量化单细胞成像,以评估F-/G-actin分数和细胞形态.
- 同免疫沉和体外拉下测试以确认蛋白质相互作用.
- 同定位研究分析神经元中SMN和actin之间的空间关系.
主要成果:
- 失去SMN会导致F-/G-actin比率的改变以及F-actin组织的缺陷.
- SMN直接与G-actin和F-actin结合,独立于它与profilin2a的相互作用.
- 两种不同的SMN-actin群体 (SMN-profilin2a-actin和SMN-actin) 被提议用于调节actin动态.
- SMA神经元显示SMN-actin同定位被破坏,SMN恢复部分挽救.
- SMN恢复改善了F-/G-actin失调,但没有改善SMN-actin同局部缺陷.
结论:
- SMN蛋白具有直接结合actin的新功能,与其已知的与profilin2a的相互作用分开.
- 这种直接的SMN-actin相互作用在调节神经元actin动态方面发挥着重要作用.
- 了解这种相互作用为SMA病原和潜在的治疗点提供了新的见解.
相关概念视频
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
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
Introduction to Actin
5.0K
Actin is a highly conserved cytoskeletal protein found abundantly in eukaryotic cells. It constitutes 10% weight of the total cellular protein in muscle cells, while in non-muscle cells, it is lower and makes up around 1–5 percent of the total cell protein. Actin found in the unicellular amoebae and complex multicellular animals is around 80% similar, demonstrating their conservation over a billion years of evolution. Actin coding genes are conserved within species and across...
5.0K
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
The Sarcomere
7.8K
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...
7.8K
Actin Treadmilling
8.0K
Actin filaments undergo polymerization and depolymerization from either end. The polymerization and depolymerization rates depend on the cytosolic concentration of free G-actins. The polymerization rate is generally higher at the plus or barbed end, while the depolymerization rate is higher at the minus or pointed end. At a steady state, critical concentration describes the concentration of free G-actin monomers at which the polymerization rate at the plus end is equal to that of the...
8.0K


