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High-viscosity injector-based pink-beam serial crystallography of microcrystals at a synchrotron radiation source

机译:基于高粘度注射器的同步加速器辐射源微晶体的粉束串联晶体学

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Since the first successful serial crystallography (SX) experiment at a synchrotron radiation source, the popularity of this approach has continued to grow showing that third-generation synchrotrons can be viable alternatives to scarce X-ray free-electron laser sources. Synchrotron radiation flux may be increased ∼100 times by a moderate increase in the bandwidth (`pink beam' conditions) at some cost to data analysis complexity. Here, we report the first high-viscosity injector-based pink-beam SX experiments. The structures of proteinase K (PK) and A2A adenosine receptor (A2AAR) were determined to resolutions of 1.8 and 4.2 Å using 4 and 24 consecutive 100 ps X-ray pulse exposures, respectively. Strong PK data were processed using existing Laue approaches, while weaker A2AAR data required an alternative data-processing strategy. This demonstration of the feasibility presents new opportunities for time-resolved experiments with microcrystals to study structural changes in real time at pink-beam synchrotron beamlines worldwide.
机译:自从首次在同步加速器辐射源上成功进行串行晶体学(SX)实验以来,这种方法的受欢迎程度持续增长,这表明第三代同步加速器可以替代稀缺的X射线自由电子激光源。通过适当增加带宽(“粉红色束”条件),可以将同步加速器的辐射通量增加约100倍,而这会增加数据分析的复杂性。在这里,我们报告了第一个基于高粘度注射器的粉束SX实验。分别使用4和24次连续100 ps X射线脉冲曝光,分别测定了蛋白酶K(PK)和A2A腺苷受体(A2AAR)的结构,分辨率分别为1.8和4.2。使用现有的Laue方法处理强PK数据,而较弱的A2AAR数据则需要另一种数据处理策略。这种可行性的证明为微晶体时间分辨实验提供了新的机会,以便在全球范围内实时研究粉束同步加速器光束线的结构变化。

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