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TitleSeeing tobacco mosaic virus through direct electron detectors.
Journal, issue, pagesJ Struct Biol, Vol. 189, Issue 2, Page 87-97, Year 2015
Publish dateDec 17, 2014
AuthorsSimon A Fromm / Tanmay A M Bharat / Arjen J Jakobi / Wim J H Hagen / Carsten Sachse /
PubMed AbstractWith the introduction of direct electron detectors (DED) to the field of electron cryo-microscopy, a wave of atomic-resolution structures has become available. As the new detectors still require ...With the introduction of direct electron detectors (DED) to the field of electron cryo-microscopy, a wave of atomic-resolution structures has become available. As the new detectors still require comparative characterization, we have used tobacco mosaic virus (TMV) as a test specimen to study the quality of 3D image reconstructions from data recorded on the two direct electron detector cameras, K2 Summit and Falcon II. Using DED movie frames, we explored related image-processing aspects and compared the performance of micrograph-based and segment-based motion correction approaches. In addition, we investigated the effect of dose deposition on the atomic-resolution structure of TMV and show that radiation damage affects negative carboxyl chains first in a side-chain specific manner. Finally, using 450,000 asymmetric units and limiting the effects of radiation damage, we determined a high-resolution cryo-EM map at 3.35Å resolution. Here, we provide a comparative case study of highly ordered TMV recorded on different direct electron detectors to establish recording and processing conditions that enable structure determination up to 3.2Å in resolution using cryo-EM.
External linksJ Struct Biol / PubMed:25528571 / PubMed Central
MethodsEM (helical sym.)
Resolution3.35 - 4.2 Å
Structure data

EMDB-2833:
Cryo-EM structure of TMV reconstructed from micrographs recorded with the K2 Summit DED
Method: EM (helical sym.) / Resolution: 4.0 Å

EMDB-2834:
Cryo-EM structure of TMV reconstructed from micrographs recorded with the Falcon II DED
Method: EM (helical sym.) / Resolution: 3.7 Å

EMDB-2835:
Cryo-EM structure of TMV reconstructed from data ranging from 2.0-6.1 e-/A^2 accumulated dose
Method: EM (helical sym.) / Resolution: 3.5 Å

EMDB-2836:
Cryo-EM structure of TMV reconstructed from data ranging from 6.1-10.2 e-/A^2 accumulated dose
Method: EM (helical sym.) / Resolution: 3.5 Å

EMDB-2837:
Cryo-EM structure of TMV reconstructed from data ranging from 10.1-14.3 e-/A^2 accumulated dose
Method: EM (helical sym.) / Resolution: 3.5 Å

EMDB-2838:
Cryo-EM structure of TMV reconstructed from data ranging from 14.3-18.4 e-/A^2 accumulated dose
Method: EM (helical sym.) / Resolution: 3.6 Å

EMDB-2839:
Cryo-EM structure of TMV reconstructed from data ranging from 18.4-22.5 e-/A^2 accumulated dose
Method: EM (helical sym.) / Resolution: 3.8 Å

EMDB-2840:
Cryo-EM structure of TMV reconstructed from data ranging from 22.5-26.6 e-/A^2 accumulated dose
Method: EM (helical sym.) / Resolution: 4.1 Å

EMDB-2841:
Cryo-EM structure of TMV reconstructed from data ranging from 26.6-30.7 e-/A^2 accumulated dose
Method: EM (helical sym.) / Resolution: 4.2 Å

EMDB-2842, PDB-4udv:
Cryo-EM structure of TMV at 3.35 A resolution
Method: EM (helical sym.) / Resolution: 3.35 Å

Source
  • tobacco mosaic virus
KeywordsVIRAL PROTEIN / DIRECT ELECTRON DETECTORS / SINGLE PARTICLE HELICAL RECONSTRUCTION / HIGH RESOLUTION

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