6V21

Mouse heavy chain apoferritin determined using single-particle cryo-EM at 200 keV

Summary for 6V21

• Entry DOI: 10.2210/pdb6v21/pdb
• EMDB information: 21024
• Descriptor: Ferritin heavy chain (2 entities in total)
• Functional Keywords: homo-24-mer, storage, globular, metal binding protein, oxidoreductase
• Biological source: Mus musculus (Mouse)
• Total number of polymer chains: 24
• Total formula weight: 487315.63

Authors

Wu, M.,Lander, G.C.,Herzik, M.A. (deposition date: 2019-11-21, release date: 2020-02-12, Last modification date: 2024-03-06)

Primary citation

Wu, M.,Lander, G.C.,Herzik Jr., M.A.
Sub-2 Angstrom resolution structure determination using single-particle cryo-EM at 200 keV.
J Struct Biol X, 4:100020-100020, 2020

PubMed Abstract: Although the advent of direct electron detectors (DEDs) and software developments have enabled the routine use of single-particle cryogenic electron microscopy (cryo-EM) for structure determination of well-behaved specimens to high-resolution, there nonetheless remains a discrepancy between the resolutions attained for biological specimens and the information limits of modern transmission electron microscopes (TEMs). Instruments operating at 300 kV equipped with DEDs are the current paradigm for high-resolution single-particle cryo-EM, while 200 kV TEMs remain comparatively underutilized for purposes beyond sample screening. Here, we expand upon our prior work and demonstrate that one such 200 kV microscope, the Talos Arctica, equipped with a K2 DED is capable of determining structures of macromolecules to as high as ∼1.7 Å resolution. At this resolution, ordered water molecules are readily assigned and holes in aromatic residues can be clearly distinguished in the reconstructions. This work emphasizes the utility of 200 kV electrons for high-resolution single-particle cryo-EM and applications such as structure-based drug design.

PubMed: 32647824
DOI: 10.1016/j.yjsbx.2020.100020

Experimental method

ELECTRON MICROSCOPY (1.75 Å)