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Viscous-medium-based crystal support in a sample holder for fixed-target serial femtosecond crystallography
Journal of Applied Crystallography ( IF 5.2 ) Pub Date : 2020-07-24 , DOI: 10.1107/s1600576720008663
Keondo Lee , Donghyeon Lee , Sangwon Baek , Jaehyun Park , Sang Jae Lee , Sehan Park , Wan Kyun Chung , Jong-Lam Lee , Hyun-Soo Cho , Yunje Cho , Ki Hyun Nam

Serial femtosecond crystallography (SFX) enables the determination of the room-temperature crystal structure of macromolecules, as well as providing time-resolved molecular dynamics data in pump–probe experiments. Fixed-target SFX (FT-SFX) can minimize sample consumption and physical effects on crystals during sample delivery. In FT-SFX studies, having a sample holder that can stably fix crystal samples is one of the key elements required for efficient data collection. Hence, development of sample holders from new materials capable of supporting various crystal sizes and shapes may expand the applications of FT-SFX. Here, a viscous-media-based crystal support in a sample holder for FT-SFX is introduced. Crystal samples were embedded in viscous media, namely gelatin and agarose, which were enclosed in a polyimide film. In the vertically placed sample holder, 10–15%(w/v) viscous gelatin and 1–4%(w/v) agarose gel stably supported crystals between two polyimide films, thereby preventing the crystals from descending owing to gravity. Using this method, FT-SFX experiments were performed with glucose isomerase and lysozyme embedded in gelatin and agarose, respectively. The room-temperature crystal structures of glucose isomerase and lysozyme were successfully determined at 1.75 and 1.80 A resolutions, respectively. The glucose isomerase and lysozyme diffraction analyses were not impeded by excessive background scattering from the viscous media. This method is useful for delivering crystal samples of various sizes and shapes in FT-SFX experiments.

中文翻译:

用于固定目标串行飞秒晶体学的样品架中的基于粘性介质的晶体支架

串行飞秒晶体学 (SFX) 能够确定大分子的室温晶体结构,并在泵-探针实验中提供时间分辨的分子动力学数据。固定目标 SFX (FT-SFX) 可以最大限度地减少样品传输过程中的样品消耗和对晶体的物理影响。在 FT-SFX 研究中,拥有可以稳定固定晶体样品的样品架是高效收集数据所需的关键要素之一。因此,开发能够支持各种晶体尺寸和形状的新材料的样品架可能会扩展 FT-SFX 的应用。在这里,介绍了 FT-SFX 样品架中基于粘性介质的晶体支架。晶体样品嵌入粘性介质中,即明胶和琼脂糖,它们被封闭在聚酰亚胺薄膜中。在垂直放置的样品架中,10-15%(w/v) 粘性明胶和 1-4%(w/v) 琼脂糖凝胶稳定支撑两个聚酰亚胺薄膜之间的晶体,从而防止晶体因重力而下降。使用这种方法,分别用嵌入明胶和琼脂糖中的葡萄糖异构酶和溶菌酶进行 FT-SFX 实验。葡萄糖异构酶和溶菌酶的室温晶体结构分别在 1.75 和 1.80 A 分辨率下成功测定。葡萄糖异构酶和溶菌酶衍射分析不受来自粘性介质的过度背景散射的阻碍。这种方法可用于在 FT-SFX 实验中提供各种尺寸和形状的晶体样品。从而防止晶体因重力而下降。使用这种方法,分别用嵌入明胶和琼脂糖中的葡萄糖异构酶和溶菌酶进行 FT-SFX 实验。葡萄糖异构酶和溶菌酶的室温晶体结构分别在 1.75 和 1.80 A 分辨率下成功测定。葡萄糖异构酶和溶菌酶衍射分析不受来自粘性介质的过度背景散射的阻碍。这种方法可用于在 FT-SFX 实验中提供各种尺寸和形状的晶体样品。从而防止晶体因重力而下降。使用这种方法,分别用嵌入明胶和琼脂糖中的葡萄糖异构酶和溶菌酶进行 FT-SFX 实验。葡萄糖异构酶和溶菌酶的室温晶体结构分别在 1.75 和 1.80 A 分辨率下成功测定。葡萄糖异构酶和溶菌酶衍射分析不受来自粘性介质的过度背景散射的阻碍。这种方法可用于在 FT-SFX 实验中提供各种尺寸和形状的晶体样品。葡萄糖异构酶和溶菌酶的室温晶体结构分别在 1.75 和 1.80 A 分辨率下成功测定。葡萄糖异构酶和溶菌酶衍射分析不受来自粘性介质的过度背景散射的阻碍。这种方法可用于在 FT-SFX 实验中提供各种尺寸和形状的晶体样品。葡萄糖异构酶和溶菌酶的室温晶体结构分别在 1.75 和 1.80 A 分辨率下成功测定。来自粘性介质的过度背景散射不会妨碍葡萄糖异构酶和溶菌酶衍射分析。这种方法可用于在 FT-SFX 实验中提供各种尺寸和形状的晶体样品。
更新日期:2020-07-24
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