Abstract
To analyze if chemical cell wall alterations contribute to penicillin-induced bacteriolysis, changes in the amount, stability, and chemical composition of staphylococcal cell walls were investigated. All analyses were performed before onset of bacteriolysis i.e. during the first 60 min following addition of different penicillin G doses. Only a slight reduction of the amount of cell wall material incorporated after penicillin addition at the optimal lytic concentration was observed as compared to control cells. However, the presence of higher penicillin G concentrations reduced the incorporation of wall material progressively without bacteriolysis. Losses of wall material during isolation of dodecylsulfate insoluble cell walls were monitored to assess the stability of the wall material following penicillin addition. Wall material grown at the lytic penicillin concentration was least stable but about 30% of the newly incorporated wall material withstood even the harsh conditions of mechanical breakage and dodecylsulfate treatment. Dodecylsulfate insoluble cell walls were used for chemical analyses. While peptidoglycan chain length was unaffected in the presence of penicillin, other wall parameters were considerably altered: peptide cross-linking was reduced in the wall material synthesized after addition of penicillin; reductions from approx. 85% in controls to about 60% were similar for lytic and also for very high penicillin concentrations leading to nonlytic death. O-acetylation was also reduced after treatment with penicillin; this effect paralleled the occurence of subsequent bacteriolysis at different drug concentrations. The results are not consistent with hypotheses explaining penicillin-induced lysis as a result of an overall weakened cell wall structure or an overall activation of autolytic wall enzymes but not conflicting with the model that ascribes penicillin-induced bacteriolysis as the result of a very restricted, local perforation of the peripheral cell wall (murosome-induced bacteriolysis).
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Abbreviations
- CL:
-
Cross-linking
- DNFB:
-
2,4-dinitro-1-fluorobenzole
- MIC:
-
Minimal inhibitory concentration
- OD:
-
Optical density at 578 nm
- PEN:
-
Penicillin G
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Sidow, T., Johannsen, L. & Labischinski, H. Penicillin-induced changes in the cell wall composition of Staphylococcus aureus before the onset of bacteriolysis. Arch. Microbiol. 154, 73–81 (1990). https://doi.org/10.1007/BF00249181
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DOI: https://doi.org/10.1007/BF00249181