An automated liquid jet for fluorescence dosimetry and microsecond radiolytic labeling of proteins.

An automated liquid jet for fluorescence dosimetry and microsecond radiolytic labeling of proteins.
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DOI:
10.1038/s42003-022-03775-1
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发表时间:
2022-08-25
影响因子:
5.9
通讯作者:
--
中科院分区:
生物学2区
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--
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X-ray radiolytic labeling uses broadband X-rays for in situ hydroxyl radical labeling to map protein interactions and conformation. High flux density beams are essential to overcome radical scavengers. However, conventional sample delivery environments, such as capillary flow, limit the use of a fully unattenuated focused broadband beam. An alternative is to use a liquid jet, and we have previously demonstrated that use of this form of sample delivery can increase labeling by tenfold at an unfocused X-ray source. Here we report the first use of a liquid jet for automated inline quantitative fluorescence dosage characterization and sample exposure at a high flux density microfocused synchrotron beamline. Our approach enables exposure times in single-digit microseconds while retaining a high level of side-chain labeling. This development significantly boosts the method’s overall effectiveness and efficiency, generates high-quality data, and opens up the arena for high throughput and ultrafast time-resolved in situ hydroxyl radical labeling. A high-speed liquid jet delivery system improves the X-ray footprinting and mass spectrometry method to label proteins for structural studies.
同步加速器 X 射线足迹法是一种可视化蛋白质中水的方法。
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