Linked Life Data

20630858

Source:http://linkedlifedata.com/resource/pubmed/id/20630858

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
2010-10-7
pubmed:abstractText
Cryo-electron microscopy of vitreous sections (CEMOVIS) and cryo-electron tomography (cryo-ET) of vitrified specimens are gradually gaining popularity. However, similar to the conventional methods, these techniques tend to produce different images of the same sample. In CEMOVIS, the mechanical stress caused by sectioning may cause inaccuracies smaller than those caused by crevasses. Therefore, we examined Escherichia coli cells by using CEMOVIS and cryo-ET to determine the differences in the computed sizes of the envelope layers, which are smaller than crevasses. We found that the width of the periplasmic space in vitreous sections and tomograms was 12 and 14 nm, respectively; furthermore, while the distance between the outer membrane (OM) and the peptidoglycan (PG) layer was almost equal (11 nm) in the two techniques, that between the plasma membrane (PM) and PG was clearly different. Thus, the observed size difference can be mainly attributed to the PM-PG distance. Since our data were obtained from images acquired using the same microscope in the same conditions, the size differences cannot be attributed to microscope-related factors. One possible factor is the angle of the cutting plane against the long axis of the cell body in CEMOVIS. However, the same PG-OM distance in both methods may exclude the variations caused by this factor. Furthermore, the mechanical stress caused by vitreous sectioning or high-pressure freezing may result in shrinkage. If this shrinkage is responsible for the nanometre-scale deformation in CEMOVIS, this factor will have to be considered in determining the molecular resolution obtained by CEMOVIS.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
1477-9986
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
59
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
419-26
pubmed:meshHeading
pubmed:year
2010
pubmed:articleTitle
Comparison of the envelope architecture of E. coli using two methods: CEMOVIS and cryo-electron tomography.
pubmed:affiliation
Institute for Protein Research, Laboratory of Protein Synthesis and Expression, Osaka University, 3-2 Yamadaoka, Suita, Osaka 565-0871, Japan.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, Non-U.S. Gov't, Evaluation Studies