Gem:一种诱导的,直接的早期蛋白质,属于Ras家族
概括
在T细胞中发现了一种新的三酸 (GTP) 结合蛋白,Gem. 宝石失调抑制细胞增殖,这表明它在信号转导和细胞周期调节中的作用.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 一种名为Gem的新型三酸盐 (GTP) 结合蛋白从人类外周血液T细胞中克隆出来.
- 珍珠和Rad形成了一个新的Ras相关的GTP结合蛋白家族,Rad与II型糖尿病有关.
- 这种蛋白质家族具有独特的结构特征,包括特定的GTP结合基因和膜关联域.
研究的目的:
- 描述 Gem 蛋白质,其表达及其在细胞过程中的功能.
- 为了研究Gem在线粒原诱导的T细胞激活中的作用.
- 探索Gem在细胞增殖和信号传导途径中的潜在参与.
主要方法:
- 从基因诱导的T细胞中克隆了Gem基因.
- 在人类T细胞和3T3细胞中,Gem的短暂表达.
- 对宝石蛋白酸化和亚细胞局部化的分析.
- 评估放松的Gem表达对细胞增殖的影响.
主要成果:
- Gem是一种35千多的GTP结合蛋白,在T细胞中表达.
- 宝石蛋白在氨酸残留物上被酸化,并在有菌性刺激时与血膜结合.
- 异常的Gem表达阻止了正常和转化3T3细胞的增殖.
结论:
- 宝石作为一个调节性蛋白质起作用,可能参与在等离子体膜的受体介导信号转导.
- 宝石在调节细胞增殖方面发挥着至关重要的作用.
- 对Gem信号通路的进一步研究可能会为T细胞激活和II型糖尿病等疾病提供见解.
相关概念视频
Rab Proteins
Rab proteins constitute the largest family of monomeric GTPases, of which 70 members are present in humans. Rab proteins and their effectors regulate consecutive stages of vesicle transport such as vesicle transport, docking, and fusion to the correct recipient membrane.
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...
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...
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:
MAPK Signaling Cascades
Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
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...
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...


