相关实验视频
Updated: Jul 10, 2026

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RhoC GTPase Activation Assay
Published on: August 22, 2010
对于Rho和Ras家族的GTPase激活剂之间的关联
J Settleman1, C F Albright, L C Foster
1Whitehead Institute for Biomedical Research, Massachusetts Institute of Technology, Cambridge 02142.
Nature
|September 10, 1992
概括
p190蛋白作为GTPase激活蛋白 (GAP) 特别适用于GTPases的rho家族. 这一发现表明,在细胞反应中,ras和rho信号通路之间存在潜在的联系.
科学领域:
- 分子生物学分子生物学
- 细胞信号传递 细胞信号传递
- 生物化学 生物化学
背景情况:
- 拉斯相关的GTPase对于细胞周期和分化等多种细胞功能至关重要.
- GTP酶激活蛋白 (GAPs) 通过刺激GTP水解来调节GTP酶的活性.
- 在生长因子刺激细胞中,ras-GAP与p190形成复合体.
研究的目的:
- 为了研究p190.0的GTPase激活蛋白 (GAP) 活性.
- 为了确定哪些GTPase家族 (ras,rho,rab) 是由p190.0调节的.
- 探索Ras-GAP/p190复合物的功能影响.
主要方法:
- 再组合的p190蛋白被净化.
- 在体外试验中进行了测试,以测试p190在ras,rho和rab GTPases上的GAP活性.
- 在细胞环境中分析了Ras-GAP和p190之间的蛋白质复合体形成.
主要成果:
- p190表现出对rho家族成员的特定GTPase激活蛋白 (GAP) 活性.
- p190没有对ras或rab家族GTPases表现出显著的GAP活性.
- p190的碳氧终端区域与其他已知的GAPs具有同质性.
结论:
- p190 作为 rho GTPases 的一个特定的 GAP 功能.
- Ras-GAP和p190之间的相互作用可能会跨越ras和rho信号通路.
- 这种相互作用可能对细胞对生长因子的反应至关重要.
相关概念视频
GTPases and their Regulation
Guanine nucleotide-binding proteins (G-proteins), also known as GTPases, are a superfamily of proteins that regulate many cellular processes, such as cell signaling, vesicular transport, and the regulation of cell shape and motility. Mutation or dysfunction of these proteins can lead to disease. There are around 40,000 known G-proteins that can broadly be classified into two groups ‒ small G-proteins consisting of a single domain and large multi-domain G-proteins.
Large G-proteins, also known...
Large G-proteins, also known...
The Ras Gene
The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
Ras is a superfamily...
Ras is a superfamily...
GTPases and their Regulation
Guanine nucleotide-binding proteins (G-proteins), also known as GTPases, are a superfamily of proteins that regulate many cellular processes, such as cell signaling, vesicular transport, and the regulation of cell shape and motility. Mutation or dysfunction of these proteins can lead to disease. There are around 40,000 known G-proteins that can broadly be classified into two groups ‒ small G-proteins consisting of a single domain and large multi-domain G-proteins.
Large G-proteins, also known...
Large G-proteins, also known...
Rab Cascades
Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
Small GTPases - Ras and Rho
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:
Activation and Inactivation of G Proteins
Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high affinity and are together...

