Heat-induced blebbing and vesiculation of the outer membrane of Escherichia coli.
AUTOR(ES)
Katsui, N
RESUMO
Thermal damage to the outer membrane of Escherichia coli W3110 was studied. When E. coli cells were heated at 55 degrees C in 50 mM Tris-hydrochloride buffer at pH 8.0, surface blebs were formed on the cell envelope, mainly at the septa of dividing cells. Membrane lipids were released from the cells during the heating period, and part of the released lipids formed vesicle-like structures from the membrane. This vesicle fraction had a lipopolysaccharide to phospholipid ratio similar to that of the outer membrane of intact cells, whereas it had a lower content of protein than the isolated outer membrane. After heating bacterial cells at 55 degrees C for 30 min, the resulting leakage from the cells of a periplasmic enzyme, alkaline phosphatase, amounted to 52% of the total activity, whereas no release of a cytoplasmic enzyme, glucose-6-phosphate dehydrogenase, was detected. The results obtained suggest that surface blebs formed by heat treatment almost completely consist of the outer membrane and that the blebs may be gradually released from the cell surface into the heating menstruum to partially form vesicles.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=220434Documentos Relacionados
- TEMPERATURE LIMITS, GENEALOGICAL ORIGIN, DEVELOPMENTAL COURSE, AND ULTIMATE FATE OF HEAT-INDUCED FILAMENTS IN ESCHERICHIA COLI MICROCULTURES
- Heat-Induced Expression and Chemically Induced Expression of the Escherichia coli Stress Protein HtpG Are Affected by the Growth Environment
- Heat Activation and Heat-induced Dormancy of Bacillus stearothermophilus Spores1
- Heat-induced Macroconidia Germination in Microsporum gypseum
- Heat-induced temperature sensitivity of outgrowing Bacillus cereus spores.
