Feasibility of one-shot-per-crystal structure determination using Laue diffraction.
Feasibility of one-shot-per-crystal structure determination using Laue diffraction.
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使用劳厄衍射单次晶体结构测定的可行性。
DOI：
10.1107/s0907444909037731
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Bilderback,DonaldH
中科院分区：
文献类型：
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作者：
Cornaby,Sterling;Szebenyi,DolethaME;Smilgies,Detlef-M;Schuller,DavidJ;Gillilan,Richard;Hao,Quan;Bilderback,DonaldH
晶体尺寸是决定在严重辐射损伤出现之前从蛋白质晶体中获得的衍射图案数量的重要因素。随着晶体尺寸的减小，该数量减少，最终降至 1，此时必须使用来自多个晶体的数据组装完整的数据集。当仅从每个晶体收集单次曝光时，多色劳厄技术可能优于单色方法，因为它同时记录每个图像的大量完全记录的反射。为了评估使用来自多个晶体的单个劳厄图像求解结构的可行性，在 CHESS D1 站使用“粉红色”光束从安装在 MicroMesh 网格上的尺寸为 20-30μm 量级的溶菌酶晶体组收集数据。单次劳厄数据用于通过分子置换进行结构测定，即使使用少至五个晶体也可以获得正确的解决方案。
Crystal size is an important factor in determining the number of diffraction patterns which may be obtained from a protein crystal before severe radiation damage sets in. As crystal dimensions decrease this number is reduced, eventually falling to one, at which point a complete data set must be assembled using data from multiple crystals. When only a single exposure is to be collected from each crystal, the polychromatic Laue technique may be preferable to monochromatic methods owing to its simultaneous recording of a large number of fully recorded reflections per image. To assess the feasibility of solving structures using single Laue images from multiple crystals, data were collected using a `pink' beam at the CHESS D1 station from groups of lysozyme crystals with dimensions of the order of 20–30 µm mounted on MicroMesh grids. Single-shot Laue data were used for structure determination by molecular replacement and correct solutions were obtained even when as few as five crystals were used.