Abstract:
:The kinetics of peptidoglycan degradation were examined under different conditions of autolysis of Escherichia coli. With cephaloridine- or moenomycin-induced autolysis, degradation did not exceed 25 to 35%, whereas in EDTA-induced autolysis it rapidly reached 65 to 70%. When nonautolyzing cells were fixed overnight with glutaraldehyde, followed by an osmium fixation, and thin sections were stained by the phosphotungstic acid method, a dark, 15-nm-thick layer of uniform appearance and constant width occupied the whole area between the inner and outer membranes of the envelope. The stained material was tentatively identified with peptidoglycan. Ultrastructural changes in this phosphotungstic acid-stained periplasmic space were investigated at different time intervals after induction of autolysis. In all cases, breakdown proceeded over the whole cell surface. During antibiotic-induced autolysis a progressive thinning down limited to the inner side of the layer was observed. During EDTA-induced autolysis, the rapid decrease in thickness correlated well with the important loss of material labeled with [3H]diaminopimelic acid. Considering these changes and the insufficient amounts of peptidoglycan (1.3 U/nm2) necessary to account for a regularly structured polymer occupying the whole 15-nm layer, it was speculated that peptidoglycan might be unevenly distributed throughout the periplasmic space.
journal_name
J Bacterioljournal_title
Journal of bacteriologyauthors
Leduc M,Frehel C,van Heijenoort Jdoi
10.1128/JB.161.2.627-635.1985subject
Has Abstractpub_date
1985-02-01 00:00:00pages
627-35issue
2eissn
0021-9193issn
1098-5530journal_volume
161pub_type
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pub_type: 杂志文章
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