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- W2149360962 abstract "The combination of a direct electron-detection camera that can count individual electrons and an algorithm for correcting for beam-induced motion in cryo-EM will facilitate determination of three-dimensional structures of smaller, lower-symmetry macromolecular complexes to higher resolution than previously possible. In recent work with large high-symmetry viruses, single-particle electron cryomicroscopy (cryo-EM) has achieved the determination of near-atomic-resolution structures by allowing direct fitting of atomic models into experimental density maps. However, achieving this goal with smaller particles of lower symmetry remains challenging. Using a newly developed single electron–counting detector, we confirmed that electron beam–induced motion substantially degrades resolution, and we showed that the combination of rapid readout and nearly noiseless electron counting allow image blurring to be corrected to subpixel accuracy, restoring intrinsic image information to high resolution (Thon rings visible to ∼3 Å). Using this approach, we determined a 3.3-Å-resolution structure of an ∼700-kDa protein with D7 symmetry, the Thermoplasma acidophilum 20S proteasome, showing clear side-chain density. Our method greatly enhances image quality and data acquisition efficiency—key bottlenecks in applying near-atomic-resolution cryo-EM to a broad range of protein samples." @default.
- W2149360962 created "2016-06-24" @default.
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- W2149360962 date "2013-05-05" @default.
- W2149360962 modified "2023-10-15" @default.
- W2149360962 title "Electron counting and beam-induced motion correction enable near-atomic-resolution single-particle cryo-EM" @default.
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- W2149360962 doi "https://doi.org/10.1038/nmeth.2472" @default.
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