Linked Life Data

9157241

Source:http://linkedlifedata.com/resource/pubmed/id/9157241

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1997-5-20
pubmed:abstractText
The cell wall structure of Salmonella typhimurium has been studied for the first time during transit from free-living to parasitic lifestyles. Peptidoglycan of S. typhimurium proliferating within human epithelial cells contains a high proportion of previously unidentified muropeptides (5-10-fold higher than in extracellular bacteria). Amino acid and mass-spectrometry analyses showed that these new components consist of dimeric cross-linked muropeptides lacking one of the two disaccharide (N-acetyl-glucosamine-beta-(1-->4)-N-acetyl-muramic acid) molecules. This unique structure suggests an active role for an N-acetyl-muramyl-L-alanine-amidase in remodelling the peptidoglycan of intracellular S. typhimurium. Additional alterations observed included: (i) the absence of glycine-containing muropeptides; (ii) the increase in the relative proportion of muropeptides cross-linked by L(meso)-diaminopimelyl-D(meso)-diaminopimelic acid (L-D) peptide bridges; and, (iii) the decrease in the global cross-linkage of the macromolecule. The structural alterations observed in the peptidoglycan of intracellular bacteria do not produce loss of the cell envelope. These results show that intracellular residence of S. typhimurium within epithelial cells is accompanied by significant changes in the bacterial cell wall. Remodelling of peptidoglycan structure may constitute another sophisticated strategy of this pathogen for adapting to and colonizing the intracellular niche of eukaryotic cells.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0950-382X
pubmed:author
pubmed:issnType
Print
pubmed:volume
23
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
693-704
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1997
pubmed:articleTitle
Peptidoglycan structure of Salmonella typhimurium growing within cultured mammalian cells.
pubmed:affiliation
Centro de Biología Molecular Severo Ochoa, CSICUAM Facultad de Ciencias, Universidad Autónoma de Madrid, Spain.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't