Isolation, Characterization, and Ultrastructure of the Peptidoglycan Layer of a Marine Pseudomonad
AUTOR(ES)
Forsberg, C. W.
RESUMO
The peptidoglycan layer of a marine pseudomonad was observed by electron microscopy in thin sections of plasmolyzed intact cells and mureinoplasts but not in untreated intact cells. Only fragments of this layer could be isolated by sodium lauryl sulfate (SLS) treatment of mureinoplast envelopes. Sacculus-like peptidoglycan structures were obtained from growing cells by immediate heat inactivation of cellular autolytic enzymes and subsequent SLS, trypsin, and nuclease treatments. Recently, similar peptidoglycan sacculus-like structures have been obtained by adding SLS to the growing culture and treating the isolated particulate material with nucleases. Thin-sectioned and negatively stained preparations of whole cell peptidoglycan showed compressed profiles of cell-shaped sacculi. Peptidoglycan prepared by SLS treatment of mureinoplast envelopes had a similar composition to that prepared from whole cells. The major amino sugars and amino acids in the peptidoglycan component were glucosamine, muramic acid, alanine, glutamic acid and diaminopimelic acid in the molar ratios 1.18:1.24:1.77:1.00:0.79. Forty-five per cent of the ε-amino groups of diaminopimelic acid were cross-linked. The peptidoglycan was estimated to account for about 1% of the cell dry weight.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=285228Documentos Relacionados
- Isolation, characterization, and in vitro assembly of the tetragonally arrayed layer of Bacillus sphaericus.
- Isolation, characterization, and biological properties of a tuberculin-active peptidoglycan isolated from the culture filtrate of Mycobacterium tuberculosis.
- Isolation, Characterization, and Action of Colicin M
- Isolation, Characterization, and Immunogenicity of Mycoplasma pneumoniae Membranes
- Isolation, characterization, and biological activity of the Methanococcus thermolithotrophicus ferredoxin.