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. 1984 Nov 1;223(3):823–830. doi: 10.1042/bj2230823

Reversible inhibition of bacterial growth after specific inhibition of spermidine synthase by dicyclohexylamine.

T Mattila, T Honkanen-Buzalski, H Pösö
PMCID: PMC1144368  PMID: 6508744

Abstract

The effect of dicyclohexylamine on seven freshly isolated bacterial strains of mastitis pathogens was studied. Streptococcus uberis was the most sensitive strain investigated, since 5 mM-dicyclohexylamine totally arrested its growth and 1.25 mM of the drug caused 60% growth inhibition. The Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa strains were also sensitive to the drug, but less so than Strep. uberis, since 5 mM drug caused only partial inhibition of growth. Micrococcus sp. and Klebsiella sp. grew in the presence of 10.0 mM-dicyclohexylamine, and, finally the growth of Streptococcus agalactiae was not at all affected by dicyclohexylamine. These different sensitivities towards dicyclohexylamine in vivo were paralleled by different sensitivities of the bacteria's spermidine synthase to the drug in vitro, and also by the ability of the drug to lower spermidine concentration in bacterial cells. Spermidine synthase from sensitive bacteria was inhibited by more than 90% by 50 microM-dicyclohexylamine in vitro, and the concentration of spermidine was decreased in E. coli and Ps. aeruginosa by 70% and in Strep. uberis by 95%, whereas in Strep. agalactiae 5 mM-dicyclohexylamine did not affect the concentration of spermidine at all. Dicyclohexylamine treatment led to the accumulation of putrescine in Strep. uberis. Spermidine synthesis catalysed by the extracts of Micrococcus sp. required 500 microM-dicyclohexylamine for 90% inhibition, and Strep. agalactiae contained a spermidine synthase that was still active at 1000 microM-dicyclohexylamine, The observed inhibition of growth was totally reversed by adding 50 microM-spermidine (final concentration) to the medium. Putrescine reversed the inhibition only when bacteria had a spermidine synthase activity insensitive to dicyclohexylamine. Spermine did not overcome the inhibition of growth caused by dicyclohexylamine, probably because it was not taken up by the bacterial cells used in this study. The inhibition of the growth by dicyclohexylamine (even in the case of Strep. uberis) was reversible in the sense that addition of 50 microM-spermidine 18 h after dicyclohexylamine still restored the growth rate of untreated controls.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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