6CL7 image
Entry Detail
PDB ID:
6CL7
EMDB ID:
Keywords:
Title:
1.71 A MicroED structure of proteinase K at 0.86 e- / A^2
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2018-03-02
Release Date:
2018-05-16
Method Details:
Experimental Method:
Resolution:
1.71 Å
R-Value Free:
0.25
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 43 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Proteinase K
Chain IDs:A
Chain Length:279
Number of Molecules:1
Biological Source:Parengyodontium album
Ligand Molecules
Primary Citation
Analysis of Global and Site-Specific Radiation Damage in Cryo-EM.
Structure 26 759 766.e4 (2018)
PMID: 29706530 DOI: 10.1016/j.str.2018.03.021

Abstact

Micro-crystal electron diffraction (MicroED) combines the efficiency of electron scattering with diffraction to allow structure determination from nano-sized crystalline samples in cryoelectron microscopy (cryo-EM). It has been used to solve structures of a diverse set of biomolecules and materials, in some cases to sub-atomic resolution. However, little is known about the damaging effects of the electron beam on samples during such measurements. We assess global and site-specific damage from electron radiation on nanocrystals of proteinase K and of a prion hepta-peptide and find that the dynamics of electron-induced damage follow well-established trends observed in X-ray crystallography. Metal ions are perturbed, disulfide bonds are broken, and acidic side chains are decarboxylated while the diffracted intensities decay exponentially with increasing exposure. A better understanding of radiation damage in MicroED improves our assessment and processing of all types of cryo-EM data.

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