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Ras 超家族小 GTP 酶(如 Ras、Rho、Rab、Arf 和 Ran 蛋白)就像一个二进制开关,在与 GDP 结合的 "关态 "和与 GTP 结合的 "开态 "之间循环,从而向下游传递信号。在细胞中,这两种状态之间的循环主要由两类调节蛋白控制:激活型鸟嘌呤核苷酸交换因子(GEFs)和失活型 GTPase 激活蛋白(GAPs)。
Ras 超家族的小 G 蛋白通常具有内在 GTPase 活性,这意味着它们在被 GEF 激活(GTP 结合)后,最终会 "自行关闭"。不过,固有 GTPase 的速率通常非常缓慢,因此 "自动 "关闭过程可能需要长达数小时。
由于大多数 Ras 超家族 GTP 酶的固有 GTP 酶活性缓慢,因此它们的 GAP 是重要的信号分子,具有终止信号传导的功能。GAP 的功能是与目标 G 蛋白的活性 GTP 结合,极大地刺激 G 蛋白的内在 GTPase 活性,从而快速关闭 G 蛋白。
RhoGAP生化分析试剂盒可检测 G 蛋白依赖 GTP 水解为 GDP + Pi 所产生的无机磷酸(Pi)的量。该试剂盒包含检测所需的所有试剂,包括 GTP 酶、阳性对照 RhoGAP、精心优化的缓冲液和磷酸盐检测试剂。检测可在 96 孔板或 384 孔板中进行。在 96 孔板中,试剂足够进行 80 次检测(每种提供的 GTPase 可检测 20 次);在 384 孔板中,试剂足够进行 160 次检测(每种提供的 GTPase 可检测 40 次)。

图 1. RhoGAP 活性以 RhoA 蛋白水解 GTP 的情况来衡量。 每个反应包含反应缓冲液 + GTP,并分别加入 RhoA(RhoA)、RhoGAP(GAP)或 RhoA + RhoGAP(RhoA + GAP)。 反应在 37°C 孵育 20 分钟。加入 CytoPhos™ 试剂并在 650 纳米波长处读取吸光度,测量 GTP 水解产生的磷酸盐。测试了添加或不添加 p50RhoGAP 催化域的 RhoA 的 GTPase 活性。
RhoGAP生化分析试剂盒具有如下优势和特点:
- 确定未表征 GAP 的活性和 GTPase 特异性。
- 小 GTP 酶及其相关 GAP 的生化特征。
- 研究不同辅助因子或蛋白质结构域对 GAP 活性的调节。
- 筛选 GAP 或 GTP 酶的突变蛋白,以确定其活性和底物特异性。
- 以 HTS(高通量筛选)形式鉴定 GAP 抑制剂。如需大量购买本试剂盒中的任何试剂,请咨询我们。
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RhoGAP生化分析试剂盒
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FAQ
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Author Title Journal Year Article Link Lippincott, Margaret F. et al. The p190 RhoGAPs, ARHGAP35, and ARHGAP5 are implicated in GnRH neuronal development: Evidence from patients with idiopathic hypogonadotropic hypogonadism, zebrafish, and in vitro GAP activity assay Genetics in Medicine 2022 Li, Ching Fei et al. Snail-induced claudin-11 prompts collective migration for tumour progression Nature Cell Biology 2019 ISSN 1476-4679 Diring, Jessica et al. RPEL-family rhoGAPs link Rac/Cdc42 GTP loading to G-actin availability Nature Cell Biology 2019 ISSN 1476-4679 Lee, Suho et al. Pyk2 signaling through graf1 and rhoA GTPase is required for amyloid-β oligomer-triggered synapse loss Journal of Neuroscience 2019 ISSN 1529-2401 Palsuledesai, Charuta C. et al. Activation of Rho Family GTPases by Small Molecules ACS Chemical Biology 2018 ISSN 1554-8937 Nüchel, Julian et al. TGFB1 is secreted through an unconventional pathway dependent on the autophagic machinery and cytoskeletal regulators Autophagy 2018 ISSN 1554-8635 Shin, Yoonjae et al. RASAL3 preferentially stimulates GTP hydrolysisof the rho family small GTPase rac2 Biomedical Reports 2018 ISSN 2049-9442 Lin, Ying Hung et al. RAB10 interacts with the male germ cell-specific GTPase-activating protein during mammalian spermiogenesis International Journal of Molecular Sciences 2017 ISSN 1422-0067 Sarowar, Tasnuva et al. Object phobia and altered RhoA signaling in amygdala of mice lacking RICH2 Frontiers in Molecular Neuroscience 2017 ISSN 1662-5099 Bendris, Nawal et al. SNX9 promotes metastasis by enhancing cancer cell invasion via differential regulation of RhoGTPases Molecular Biology of the Cell 2016 ISSN 1939-4586 Hernandez-Flores, Araceli et al. A new nucleocytoplasmic RhoGAP protein contributes to control the pathogenicity of Entamoeba histolytica by regulating EhRacC and EhRacD activity Cellular Microbiology 2016 ISSN 1462-5822 Bai, Xue et al. The smooth muscle-selective RhoGAP GRAF3 is a critical regulator of vascular tone and hypertension Nature Communications 2013 ISSN 2041-1723 Zanin, Esther et al. A conserved RhoGAP limits M phase contractility and coordinates with microtubule asters to confine RhoA during Cytokinesis Developmental Cell 2013 ISSN 1534-5807 de Kreuk, Bart Jan et al. The Human Minor Histocompatibility Antigen1 Is a RhoGAP PLoS ONE 2013 ISSN 1932-6203 Xu, Jie et al. RhoGAPs Attenuate Cell Proliferation by Direct Interaction with p53 Tetramerization Domain Cell Reports 2013 ISSN 2211-1247 Taniuchi, Keisuke et al. BART Inhibits Pancreatic Cancer Cell Invasion by Rac1 Inactivation through Direct Binding to Active Rac1 Neoplasia 2012 ISSN 1476--5586 Gaus, Kristin et al. Destabilization of YopE by the ubiquitin-proteasome pathway fine-tunes yop delivery into host cells and facilitates systemic spread of Yersinia enterocolitica in host lymphoid tissue Infection and Immunity 2011 ISSN 0019-9567 Zhang, Ning et al. A novel testis-specific GTPase serves as a link to proteasome biogenesis: Functional characterization of RhoS/RSA-14-44 in spermatogenesis Molecular Biology of the Cell 2010 ISSN 1059-1524 Songsungthong, Warangkhana et al. ROS-inhibitory activity of YopE is required for full virulence of Yersinia in mice Cellular Microbiology 2010 ISSN 1462-5814 Köhli, Michael et al. The fuction of two closely related Rho proteins is determined by an atypical switch I region Journal of Cell Science 2008 ISSN 0021-9533 Vogt, D. L. et al. ARHGAP4 is a novel RhoGAP that mediates inhibition of cell motility and axon outgrowth Molecular and Cellular Neuroscience 2007 ISSN 1044-7431 Rothenfluh, Adrian et al. Distinct Behavioral Responses to Ethanol Are Regulated by Alternate RhoGAP18B Isoforms Cell 2006 ISSN 0092-8674
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