动因动力学通过调节其协活性剂MAL来控制SRF活性
Francesc Miralles1, Guido Posern, Alexia-Ileana Zaromytidou
1Transcription Laboratory, Room 401, Cancer Research UK London Research Institute, Lincolns Inn Fields Laboratories, 44 Lincoln's Inn Fields, London WC2A 3PX, UK.
Cell
|May 7, 2003
概括
罗GTPases通过调节活性蛋白聚合来控制转录因子SRF. 这项研究揭示了Rho-actin信号引导SRF联合激活器MAL的核定位,这是SRF活动的关键机制.
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:
- 罗GTPases是actin细胞骨架的关键调节者.
- 转录因子血清响应因子 (SRF) 控制基因表达,以应对动因动态.
- 连接Rho-actin信号与SRF活动的确切机制,特别是协同激活剂的作用,仍然难以捉摸.
研究的目的:
- 阐明Rho-actin信号调节SRF活动的机制.
- 研究与肌肉相关的SRF联合激活剂MAL在该途径中的作用.
- 通过Rho-actin信号传递来表征MAL亚细胞局部的调节.
主要方法:
- 使用血清刺激和Rho通路激活的细胞局部化研究.
- 对MAL突变的分析,以确定功能域.
- 生物化学测试以评估MAL-actin相互作用.
- 染色体免疫沉用于识别SRF标促进体.
主要成果:
- 对于MAL的核积累,rho-actin信号是必要的,也是足够的.
- 马尔的N端RPEL动机对于感知Rho-actin信号传递和结合非聚合性actin至关重要.
- 特定的MAL区域中介于核导入和细胞质保留.
- 构成细胞质的MAL突变物破坏了SRF调节.
- 马尔与由Rho-actin信号调节的SRF基因促进体相关.
结论:
- 罗-动因信号控制SRF活动,通过调节协活性器MAL的核定位.
- MAL作为Rho-actin动态的直接传感器,将细胞骨变化与转录调节联系起来.
- 这种机制为我们提供了关于细胞外信号是如何通过actin细胞骨架传递到细胞核的新见解.
相关概念视频
Co-activators and Co-repressors
7.0K
Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
7.0K
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
Actin Filament Depolymerization
3.0K
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...
3.0K
Regulation of Nuclear Protein Sorting
2.5K
Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
2.5K
Mechanism of Filopodia Formation
2.5K
Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
2.5K
Cytoskeletal Coordination in Cell Migration
4.9K
A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker...
4.9K


