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Title: Ab initio structure determination from prion nanocrystals at atomic resolution by MicroED

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America

Electrons, because of their strong interaction with matter, produce high-resolution diffraction patterns from tiny 3D crystals only a few hundred nanometers thick in a frozen-hydrated state. This discovery offers the prospect of facile structure determination of complex biological macromolecules, which cannot be coaxed to form crystals large enough for conventional crystallography or cannot easily be produced in sufficient quantities. Two potential obstacles stand in the way. The first is a phenomenon known as dynamical scattering, in which multiple scattering events scramble the recorded electron diffraction intensities so that they are no longer informative of the crystallized molecule. The second obstacle is the lack of a proven means of de novo phase determination, as is required if the molecule crystallized is insufficiently similar to one that has been previously determined.We showwith four structures of the amyloid core of the Sup35 prion protein that, if the diffraction resolution is high enough, sufficiently accurate phases can be obtained by direct methods with the cryo-EM method microelectron diffraction (MicroED), just as in X-ray diffraction. The success of these four experiments dispels the concern that dynamical scattering is an obstacle to ab initio phasing by MicroED and suggests that structures of novel macromolecules can also be determined by direct methods.

Research Organization:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FC02-02ER63421
OSTI ID:
1425979
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 113, Issue 40; ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 66 works
Citation information provided by
Web of Science

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Cited By (17)

The Crystal Structure of Orthocetamol Solved by 3D Electron Diffraction journal July 2019
In situ protein micro-crystal fabrication by cryo-FIB for electron diffraction journal November 2018
Atomic-resolution structures from fragmented protein crystals with the cryoEM method MicroED journal February 2017
A new era for understanding amyloid structures and disease journal September 2018
The cryo-EM method microcrystal electron diffraction (MicroED) journal April 2019
Sub-ångström cryo-EM structure of a prion protofibril reveals a polar clasp journal January 2018
Nanoscale mosaicity revealed in peptide microcrystals by scanning electron nanodiffraction journal January 2019
Data-driven challenges and opportunities in crystallography journal July 2019
MicroED methodology and development journal January 2020
In situ protein micro-crystal fabrication by cryo-FIB for electron diffraction posted_content July 2018
Homochiral and racemic MicroED structures of a peptide repeat from the ice-nucleation protein InaZ journal January 2019
MicroED methodology and development journal July 2019
The Crystal Structure of Orthocetamol Solved by 3D Electron Diffraction journal August 2019
MicroED data collection with SerialEM journal June 2019
Homochiral and racemic MicroED structures of a peptide repeat from the ice-nucleation protein InaZ text January 2019
3D Electron Diffraction: The Nanocrystallography Revolution journal July 2019
Macromolecular Nanocrystal Structural Analysis with Electron and X-Rays: A Comparative Review journal September 2019

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