需要RAFT1与gephyrin的相互作用,用于对拉巴胺素敏感的信号传输
D M Sabatini1, R K Barrow, S Blackshaw
1The Johns Hopkins University School of Medicine, Department of Neuroscience, 725 North Wolfe Street, Baltimore, MD 21205, USA.
概括
哺乳动物的目标拉巴胺素 (mTOR) 蛋白与神经元甘氨酸受体集群中的关键组成部分基菲林相互作用. 这种相互作用对于mTOR信号通路至关重要,包括那些调节蛋白质合成的信号通路.
科学领域:
- 细胞生物学 细胞生物学
- 神经科学是一个神经科学.
- 分子生物学分子生物学
背景情况:
- RAFT1 (拉巴胺素和FKBP12目标1),也称为FRAP或mTOR,是一种与ATM相关的蛋白质,对于调节拉巴胺素的作用和调节mRNA翻译至关重要.
- 盖菲林是一种必不可少的蛋白质,用于在神经元细胞膜上聚合甘氨酸受体.
研究的目的:
- 为了研究RAFT1/mTOR和gephyrin之间的相互作用.
- 确定这种相互作用在细胞信号通路中的功能意义.
主要方法:
- 同免疫沉测试检测蛋白质与蛋白质相互作用.
- 对无法与gephyrin结合的RAFT1突变的分析.
- 对下游信号分子的评估,如p70核糖体S6激酶和4E-BP1.1.
主要成果:
- 发现RAFT1/mTOR在哺乳动物细胞中与gephyrin相互作用.
- 缺乏葛林关联的RAFT1突变未能激活下游信号分子.
- 这种相互作用凸显了gephyrin在信号传导中的作用.
结论:
- RAFT1/mTOR和gephyrin之间的相互作用对于mTOR介导的信号传输至关重要.
- 盖菲林在细胞信号传导途径中起着重要作用.
- 与ATM相关的蛋白质的氨基终端区域,如RAFT1,可以调解与其他蛋白质的相互作用,如gephyrin.
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...
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...
GPCR Desensitization
G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
Transducer Mechanism: G Protein–Coupled Receptors
G Protein–Coupled Receptors (GPCRs) are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to various stimuli. GPCRs regulate critical physiological pathways and are excellent drug targets for treating diseases such as diabetes, cancer, obesity, depression, or Alzheimer's. Nearly 35% of approved drugs implement their therapeutic effects by selectively interacting with specific GPCRs.
GPCRs are also called heptahelical, 7TM, or...
GPCRs are also called heptahelical, 7TM, or...


