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MR Hei-Mix S

Company: Heidolph Instruments
Catalog#: Hei-Mix S
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Production, Purification and Crystallization of a Prokaryotic SLC26 Homolog for Structural Studies
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2017-02-05
[Abstract]  The SLC26 or SulP proteins constitute a large family of anion transporters that are ubiquitously expressed in pro- and eukaryotes. In human, SLC26 proteins perform important roles in ion homeostasis and malfunctioning of selected members is associated with diseases. This protocol details the production and crystallization of a prokaryotic SLC26 homolog, termed SLC26Dg, from Deinococcus geothermalis. Following these instructions we obtained well-folded and homogenous material of the membrane protein SLC26Dg and the nanobody Nb5776 that enabled us to crystallize the complex and determine its structure (Geertsma et al., 2015). The procedure may be adapted to purify and crystallize other membrane protein complexes. [摘要]  SLC26或SulP蛋白构成在亲和真核生物中普遍表达的大量阴离子转运蛋白。在人类中,SLC26蛋白在离子稳态中起重要作用,选择成员的功能障碍与疾病有关。该方案详细描述了来自地热异常球菌的原核SLC26同源物(称为SLC26Dg)的产生和结晶。按照这些说明,我们获得了膜蛋白SLC26Dg和纳米体Nb5776的良好折叠和均匀的材料,使我们能够使复合物结晶并确定其结构(Geertsma等人,2015)。该方法可以适于纯化和结晶其它膜蛋白复合物。

背景 除了少数例外,膜蛋白的结构表征涉及蛋白质生产水平,洗涤剂溶解状态下的稳定化和结晶的挑战。克服这些障碍所采取的策略取决于有效选择具有优异生物化学性质的SLC26同系物和使用抗体作为结晶伴侣(Geertsma等人,2015)。这里描述的程序并没有大大偏离同事的程序,但在几点上,我们采用其他方法。例如,对于蛋白质生产,我们利用araBAD启动子(Guzman等人,1995),而不是流行的T7启动子(Studier等人,1990)。与T7启动子相反,PAD启动子允许直接调节蛋白质生产水平及其对下游折叠机械的能力的调节,从而减少包涵体的形成(Geertsma, et ...

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