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Yeast Extract Granulated

Company: Melford Laboratories
Catalog#: GY1333
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Expression and Purification of Mini G Proteins from Escherichia coli
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2017-04-20
[Abstract]  Heterotrimeric G proteins modulate intracellular signalling by transducing information from cell surface G protein-coupled receptors (GPCRs) to cytoplasmic effector proteins. Structural and functional characterisation of GPCR–G protein complexes is important to fully decipher the mechanism of signal transduction. However, native G proteins are unstable and conformationally dynamic when coupled to a receptor. We therefore developed an engineered minimal G protein, mini-Gs, which formed a stable complex with GPCRs, and facilitated the crystallisation and structure determination of the human adenosine A2A receptor (A2AR) in its active conformation. Mini G proteins are potentially useful tools in a variety of applications, including characterising GPCR ... [摘要]  异源三聚体G蛋白通过将细胞表面G蛋白偶联受体(GPCR)的信息转导至细胞质效应蛋白来调节细胞内信号传导。 GPCR-G蛋白复合物的结构和功能表征对于完全破译信号转导机制是重要的。然而,当与受体偶联时,天然G蛋白质是不稳定的并具有构象的动力学。因此,我们开发了一种工程化的最小G蛋白,其与GPCR形成稳定的复合物,促进了人腺苷A 2A受体的结晶和结构测定(A 2AR)的活性构象。 Mini G蛋白是各种应用中潜在有用的工具,包括表征GPCR药理学,结合亲和力和动力学实验,激动剂药物发现和GPCR-G蛋白复合物的结构测定。在这里,我们描述了一个用于表达和纯化mini-G 的详细方案。

我们最近报告了一种工程化的最小G蛋白质(Carpenter和Tate,2016)的开发,其促进了人腺苷A 2A受体的结晶( A 2 R 2)其活性构象(Carpenter等人,2016; Carpenter和Tate,2017)。不同于需要在真核系统中表达的异源三聚体G蛋白质,在大肠杆菌(大肠杆菌)中高度表达微型G蛋白,并且可以可以容易地纯化,每升培养物的产量为50-100mg的mini-G 。在这里,我们描述了早先在Carpenter和Tate(2016)中描述的可以用于前面描述的任何一种迷你G蛋白构建体的表达和纯化的逐步方案(Carpenter等人, ...

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