Laterally mobile, functionalized self-assembled monolayers at the fluorous-aqueous interface in a plug-based microfluidic system: characterization and testing with membrane protein crystallization.

Laterally mobile, functionalized self-assembled monolayers at the fluorous-aqueous interface in a plug-based microfluidic system: characterization and testing with membrane protein crystallization.
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DOI:
10.1021/ja808697e
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发表时间:
2009-05-06
影响因子:
15
通讯作者:
Ismagilov RF
Ismagilov RF
中科院分区:
化学1区
文献类型:
--
作者:
Kreutz JE;Li L;Roach LS;Hatakeyama T;Ismagilov RF

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本文介绍了一种方法,以产生功能化的,移动的自组装单分子层(SAM)的插件为基础的微流体。界面的控制正在推进生物界面、非均相反应和纳米技术的研究。SAM对于此类研究是有用的,但它们不是横向移动的。基于脂质的方法虽然是移动的,但不容易进行结晶筛选所需的数百个实验。在这里,我们展示了一种方法,补充目前的SAM和脂质的方法,用于快速生成移动的,功能化的SAM。这种方法依赖于塞子,即被氟载体流体包围的液滴,以快速探索化学空间。具体而言,我们实施了组氨酸标签结合化学设计一种新的氟化两亲物,RfNTA,使用改进的一步合成RfOEG在Mitsunobu条件下。RfNTA在氟-水界面引入蛋白质的特异性结合,即使在其他表面活性剂存在下,也会在界面处浓缩和定向蛋白质。然后,我们将这种方法应用于组氨酸标记的膜蛋白的结晶,反应中心从Rhodobacter sphaeroides,进行了2400次结晶试验,并表明这种方法可以增加晶体生产条件的范围,在给定条件下的成功率,成核率和形成的晶体的质量。
This paper describes a method to generate functionalizable, mobile self-assembled monolayers (SAMs) in plug-based microfluidics. Control of interfaces is advancing studies of biological interfaces, heterogeneous reactions, and nanotechnology. SAMs have been useful for such studies, but they are not laterally mobile. Lipid-based methods, though mobile, are not easily amenable to setting up the hundreds of experiments necessary for crystallization screening. Here we demonstrate a method, complementary to current SAM and lipid methods, for rapidly generating mobile, functionalized SAMs. This method relies on plugs, droplets surrounded by a fluorous carrier fluid, to rapidly explore chemical space. Specifically, we implemented his-tag binding chemistry to design a new fluorinated amphiphile, RfNTA, using an improved one-step synthesis of RfOEG under Mitsunobu conditions. RfNTA introduces specific binding of protein at the fluorous−aqueous interface, which concentrates and orients proteins at the interface, even in the presence of other surfactants. We then applied this approach to the crystallization of a his-tagged membrane protein, Reaction Center fromRhodobacter sphaeroides, performed 2400 crystallization trials, and showed that this approach can increase the range of crystal-producing conditions, the success rate at a given condition, the rate of nucleation, and the quality of the crystal formed.
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