在块共聚物中磁性定向的OmpF膜蛋白的二维结晶
Steven S Klara1, Patrick O Saboe2, Ian T Sines2
1Department of Chemical Engineering, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States.
Journal of the American Chemical Society
|December 19, 2015
概括
一种新的磁场技术显著增强了膜蛋白 (MP) 的二维晶体大小和秩序. 这种方法改善了结构研究和仿生装置的结晶.
科学领域:
- 生物物理
- 结构生物学
- 材料科学
背景情况:
- 膜蛋白的二维 (2D) 结晶对于结构确定,药物设计和仿生应用至关重要.
- 在区块共聚合物 (BCP) 矩阵中制造大型,有序的MP2D晶体仍然是一个重大挑战.
- 对于更广泛的应用,需要一种可扩展的方法来对准和结晶薄膜中的MP.
研究的目的:
- 引入和验证一种用于生长更大,更有序的二维膜蛋白质晶体的新方法.
- 研究强磁场对薄膜几何形状中的MP结晶的影响.
主要方法:
- 在膜蛋白结晶过程中利用强磁场.
- 使用的外膜蛋白F (OmpF),一个β-桶MP,在聚乙烯-聚乙烯氧化物 (PB-PEO) 块共聚物膜中.
- 使用负染色电子显微镜 (EM) 和冷电子显微镜 (cryo-EM) 分析晶体大小和顺序,并进行里埃转换信号-噪声 (SNR) 分析.
主要成果:
- 在磁场中培养的晶体比传统培养的晶体大5倍.
- 在磁培养的晶体中,福里埃变换分析显示高SNR衍射峰值的数量是两倍,表明有所改善.
- 在PB-PEO膜中证明了OmpF的增强晶体大小和顺序.
结论:
- 一个强大的磁场是提高二维膜蛋白质晶体大小和顺序的有效工具.
- 这种技术为制造高质量的MP 2D晶体提供了简单可扩展的方法.
- 磁场辅助的方法有望促进结构生物学和仿生装置的开发.
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