Abstract
The Escherichia coli mutant speE deficient in the gene encoding for spermidine synthase has no absolute requirement for spermidine but shows a retarded growth rate. This growth retardation could be unspecifically restored to the respective wild type level by exogenously supplied polyamines such as spermidine, spermine and homospermidine as well as the diamines putrescine and cadaverine. In comparison to the respective wild type, the mutant shows a two-fold increased level of endogenous putrescine but displays a reduced ability to accumulate the diamines putrescine and cadaverine. The ability to accumulate polyamines is not affected. The deleted spermidine synthase gene of the mutant was substituted by heterologous expression of the hss gene from Rhodopseudomonas viridis encoding homospermidine synthase.
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Tholl, D., Harms, R., Ludwig, A. et al. Retarded growth of an Escherichia coli mutant deficient in spermidine synthase can be unspecifically repaired by addition of various polyamines. World Journal of Microbiology and Biotechnology 14, 857–863 (1998). https://doi.org/10.1023/A:1008829008065
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DOI: https://doi.org/10.1023/A:1008829008065