Abstract
The mechanism of growth inhibition by d-amino acids was studied. d-Serine at concentrations from 0.02–0.2 M was sufficient to cause partial growth inhibition in seven species of bacteria representing the four most common types of peptidoglycan. The inhibited cells displayed morphological alterations. In the nucleotide-activated peptidoglycan precursors of these cells, d-alanine residues in position 4 and/or 5 of the peptide moiety were partially or even completely replaced by d-serine. The peptidoglycan also contained d-serine instead of d-alanine, but the percentual content of d-serine was significantly lower than that in the precursors. In addition, the modified peptidoglycan was less cross-linked than the normal one. Four other d-amino acids (d-threonine, d-valine, d-leucine, d-methionine) at concentrations of about 0.2 M caused similar effects as did d-serine when applied to Corynebacterium callunae and Bacillus subtilis. Thus the mode of action of d-amino acids on peptidoglycan synthesis can be generally described as follows: in their presence, at growth inhibiting concentrations modified nucleotide-activated peptidoglycan precursors are formed in which d-alanine residues are replaced by the d-amino acids. They are less efficiently incorporated into peptidoglycan. A high percentage of the modified muropeptides remains non-cross-linked, since they are poor substrates for the transpeptidation reaction. In the majority of the organisms, cross-linking was decreased when d-alanine in position 4 of the peptide subunit was replaced, in two organisms (Corynebacterium insidiosum and Staphylococcus aureus) replacement in position 5 was most effective, however. The low extent of crosslinkage is consistent with the morphological aberrations of inhibited cells. In previous studies with glycine, results were described that were in close analogy to those obtained with d-amino acids. However, glycine can replace not only d-alanine residues in position 4 and 5 but also l-alanine in position 1 of the peptide subunit.
Zusammenfassung
In einem Konzentrationsbereich von 0,02–0,2 M hemmt d-Serin das Wachstum aller untersuchten Bakterien. Gleichzeitig traten morphologische Veränderungen der Bakterienzellen auf. In den nucleotidaktivierten Vorstufen von gehemmten Zellen wurden die d-Alaninreste des Peptidanteils ganz oder teilweise durch d-Serin ersetzt. Auch das Peptidoglycan enthielt d-Serin anstelle von d-Alanin, jedoch weiniger als in den Vorstufen. Zusätzlich war das modifizierte Peptidoglycan zu einem geringeren Anteil quervernetzt als das normale. Vier weitere d-Aminosäuren (Threonin, Valin, Leucin, Methionin) verursachten bei einer Konzentration von 0.2 M ähnliche Wirkungen wie d-Serin. Die Wirkungsweise von d-Aminosäuren auf die Peptidoglycansynthese kann daher allgemein wie folgt beschreiben werden: In Gegenwart von wachstumshemmenden Konzentrationen an d-Aminosäuren werden modifizierte nucleotidaktivierte Peptidoglycanvorstufen synthetisiert, die zu einem geringeren Ausmaß in das Peptidoglycan eingebaut und im Peptidoglycan schlechter quervernetzt werden. Der Ersatz von d-Alanin in Position 4 der Peptiduntereinheit ist dabei in der Regel am wirkungsvollsten. Nur bei Corynebacterium insidiosum und Staphylococcus aureus erwies sich der Ersatz in Position 5 als stärker hemmend. Diese Wirkungsweise entspricht weitgehend derjenigen von Glycin. Im Unterschied zur Wirkung von Glycin kann l-Alanin in Position 1 der Peptiduntereinheit nicht durch d-Aminosäuren ersetzt werden.
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Abbreviations
- Dab:
-
Diaminobuttersäure
- m-Dmp:
-
meso-Diaminopimelinsäure
- GlcNAc oder G:
-
N-Acetylglucosamin
- MurNAc oder M:
-
N-Acetylmuraminsäure
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Trippen, B., Hammes, W.P., Schleifer, KH. et al. Die Wirkung von d-Aminosäuren auf die Struktur und Biosynthese des Peptidoglycans. Arch. Microbiol. 109, 247–261 (1976). https://doi.org/10.1007/BF00446636
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DOI: https://doi.org/10.1007/BF00446636