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ayfilipe.maia@icm.uu.se
Received:03 November 2023,
Revised:05 December 2023,
Accepted:2023-12-06,
Published Online:12 January 2024,
Published:2024-12
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Tomas Ekeberg, Dameli Assalauova, Johan Bielecki, et al. Observation of a single protein by ultrafast X-ray diffraction[J]. Light: science & applications, 2024, 13(1): 80-90.
Tomas Ekeberg, Dameli Assalauova, Johan Bielecki, et al. Observation of a single protein by ultrafast X-ray diffraction[J]. Light: science & applications, 2024, 13(1): 80-90. DOI: 10.1038/s41377-023-01352-7.
The idea of using ultrashort X-ray pulses to obtain images of single proteins frozen in time has fascinated and inspired many. It was one of the arguments for building X-ray free-electron lasers. According to theory
the extremely intense pulses provide sufficient signal to dispense with using crystals as an amplifier
and the ultrashort pulse duration permits capturing the diffraction data before the sample inevitably explodes. This was first demonstrated on biological samples a decade ago on the giant mimivirus. Since then
a large collaboration has been pushing the limit of the smallest sample that can be imaged. The ability to capture snapshots on the timescale of atomic vibrations
while keeping the sample at room temperature
may allow probing the entire conformational phase space of macromolecules. Here we show the first observation of an X-ray diffraction pattern from a single protein
that of
Escherichia coli
GroEL which at 14 nm in diameter is the smallest biological sample ever imaged by X-rays
and demonstrate that the concept of diffraction before destruction extends to single proteins. From the pattern
it is possible to determine the approximate orientation of the protein. Our experiment demonstrates the feasibility of ultrafast imaging of single proteins
opening the way to single-molecule time-resolved studies on the femtosecond timescale.
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