首页> 外文期刊>Nature >Single-molecule analysis of ligand efficacy in beta(2)AR-G-protein activation
【24h】

Single-molecule analysis of ligand efficacy in beta(2)AR-G-protein activation

机译:β(2)AR-G蛋白激活中配体功效的单分子分析

获取原文
获取原文并翻译 | 示例
           

摘要

G-protein-coupled receptor (GPCR)-mediated signal transduction is central to human physiology and disease intervention, yet the molecular mechanisms responsible for ligand-dependent signalling responses remain poorly understood. In class A GPCRs, receptor activation and G-protein coupling entail outward movements of transmembrane helix 6 (TM6). Here, using single-molecule fluorescence resonance energy transfer imaging, we examine TM6 movements in the beta(2) adrenergic receptor (beta(2)AR) upon exposure to orthosteric ligands with different efficacies, in the absence and presence of the G(s) heterotrimer. We show that partial and full agonists differentially affect TM6 motions to regulate the rate at which GDP-bound beta(2)AR-G(s) complexes are formed and the efficiency of nucleotide exchange leading to G(s) activation. These data also reveal transient nucleotide-bound beta(2)AR-G(s) species that are distinct from known structures, and provide single-molecule perspectives on the allosteric link between ligand-and nucleotide-binding pockets that shed new light on the G-protein activation mechanism.
机译:G蛋白偶联受体(GPCR)介导的信号转导对人类生理和疾病干预至关重要,但对配体依赖性信号转导反应的分子机制仍然知之甚少。在A类GPCR中,受体激活和G蛋白偶联需要跨膜螺旋6(TM6)向外移动。在这里,我们使用单分子荧光共振能量转移成像技术,在不存在和存在G(s)的情况下,通过暴露于具有不同功效的正构配体,研究了β(2)肾上腺素能受体(beta(2)AR)中的TM6运动。 )异三聚体。我们显示部分和完全激动剂差异影响TM6运动,以调节GDP结合的beta(2)AR-G(s)复杂形成的速率和核苷酸交换的效率导致G(s)激活。这些数据还揭示了与已知结构不同的瞬时核苷酸结合β(2)AR-G(s)物种,并提供了配体和核苷酸结合口袋之间的变构联系的单分子观点,这为G蛋白激活机制。

著录项

  • 来源
    《Nature》 |2017年第7661期|68-73|共6页
  • 作者单位

    Weill Cornell Med, Dept Physiol & Biophys, New York, NY 10065 USA;

    Stanford Univ, Sch Med, Dept Mol & Cellular Physiol, Stanford, CA 94305 USA;

    Stanford Univ, Sch Med, Dept Mol & Cellular Physiol, Stanford, CA 94305 USA;

    Weill Cornell Med, Dept Physiol & Biophys, New York, NY 10065 USA;

    Weill Cornell Med, Dept Physiol & Biophys, New York, NY 10065 USA;

    Weill Cornell Med, Dept Physiol & Biophys, New York, NY 10065 USA;

    Weill Cornell Med, Dept Physiol & Biophys, New York, NY 10065 USA;

    Weill Cornell Med, Dept Physiol & Biophys, New York, NY 10065 USA|IBM Thomas J Watson Res Ctr, Yorktown Hts, NY USA;

    Columbia Univ Coll Phys & Surg, Dept Psychiat, 722 W 168th St, New York, NY 10032 USA|New York State Psychiat Inst & Hosp, Div Mol Therapeut, New York, NY 10032 USA|Univ Copenhagen, Dept Neurosci & Pharmacol, Lab Mol Pharmacol, Blegdamsvej 3, DK-2200 Copenhagen, Denmark|Univ Copenhagen, NNF Ctr Basic Metab Res, Blegdamsvej 3, DK-2200 Copenhagen, Denmark;

    Columbia Univ Coll Phys & Surg, Dept Psychiat, 722 W 168th St, New York, NY 10032 USA|New York State Psychiat Inst & Hosp, Div Mol Therapeut, New York, NY 10032 USA;

    Columbia Univ Coll Phys & Surg, Dept Psychiat, 722 W 168th St, New York, NY 10032 USA|New York State Psychiat Inst & Hosp, Div Mol Therapeut, New York, NY 10032 USA|Columbia Univ Coll Phys & Surg, Dept Pharmacol, 630 W 168th St, New York, NY 10032 USA;

    Weill Cornell Med, Dept Physiol & Biophys, New York, NY 10065 USA|Cornell Univ, Weill Cornell Med Coll, HRH Prince Alwaleed Bin Talal Bin Abdulaziz Alsau, New York, NY 10021 USA;

    Stanford Univ, Sch Med, Dept Mol & Cellular Physiol, Stanford, CA 94305 USA;

    Weill Cornell Med, Dept Physiol & Biophys, New York, NY 10065 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号