LUXendins reveal endogenous glucagon-like peptide-1 receptor distribution and dynamics

LUXendins reveal endogenous glucagon-like peptide-1 receptor distribution and dynamics
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LUXendins 揭示内源性胰高血糖素样肽-1 受体分布和动态

DOI:
10.1101/557132
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发表时间:
2019
期刊:
--
影响因子:
--
通讯作者:
Ast J
Ast J
中科院分区:
--
文献类型:
--
作者:
Ast J

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胰高血糖素样肽-1受体(GLP 1 R)是参与代谢的B类G蛋白偶联受体(GPCR)。目前,其可视化仅限于遗传操作,抗体检测或刺激受体激活的探针的使用。在此,我们介绍了LUXendin 645,一种远红外荧光GLP 1 R拮抗肽标记。LUXendin 645在整个活的和固定的组织中产生强烈的和特异性的膜标记。当受体在LUXendin 645存在下变构调节时,可额外诱发GLP 1 R信号传导。使用LUXendin 645和STED相容性LUXendin 651,我们描述了胰岛GLP 1 R表达模式,揭示了包括膜纳米结构域存在在内的高阶GLP 1 R组织,并跟踪单个受体亚群。我们进一步表明,不同的荧光团可以赋予激动剂的行为上的theLUXendin骨干,与稳定的肠促胰岛素模拟物的设计的影响。因此,我们的标记探针具有不同的激活模式,允许内源性GLP 1 R的可视化,并提供新的见解B类GPCR的分布和动力学。
The glucagon-like peptide-1 receptor (GLP1R) is a class B G protein-coupled receptor (GPCR) involved in metabolism. Presently, its visualization is limited to genetic manipulation, antibody detection or the use of probes that stimulate receptor activation. Herein, we presentLUXendin645, a far-red fluorescent GLP1R antagonistic peptide label.LUXendin645produces intense and specific membrane labeling throughout live and fixed tissue. GLP1R signaling can additionally be evoked when the receptor is allosterically modulated in the presence ofLUXendin645. UsingLUXendin645and STED-compatibleLUXendin651, we describe islet GLP1R expression patterns, reveal higher-order GLP1R organization including the existence of membrane nanodomains, and track single receptor subpopulations. We furthermore show that different fluorophores can confer agonistic behavior on theLUXendinbackbone, with implications for the design of stabilized incretin-mimetics. Thus, our labeling probes possess divergent activation modes, allow visualization of endogenous GLP1R, and provide new insight into class B GPCR distribution and dynamics.
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