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. 1988 Jul;170(7):3131–3135. doi: 10.1128/jb.170.7.3131-3135.1988

Adjustment of polyamine contents in Escherichia coli.

K Kashiwagi 1, K Igarashi 1
PMCID: PMC211259  PMID: 3290196

Abstract

Adjustment of polyamine contents in Escherichia coli was studied with strains of Escherichia coli producing normal (DR112) and excessive amounts of ornithine decarboxylase [DR112(pODC)] or S-adenosylmethionine decarboxylase [DR112(pSAMDC)]. Although DR112(pODC) produced approximately 70 times more ornithine decarboxylase than DR112 did, the amounts of polyamines in the cells of both strains did not change significantly. The amounts of polyamines in DR112(pODC) were adjusted by excretion of excessive amounts of putrescine to the medium. When ornithine was deficient in cells, polyamine contents in DR112(pODC) were much higher than those in DR112, although polyamine contents were low in both strains. This indicates that large amounts of ornithine decarboxylase increased the utilization of ornithine for putrescine synthesis. During ornithine deficiency, strain DR112 produced 3.4 times more ornithine decarboxylase. Strain DR112(pSAMDC) produced seven times more S-adenosylmethionine decarboxylase than DR112 did. In DR112(pSAMDC) an increase (40%) in spermidine content, a decrease (35%) in putrescine content, and no significant excretion of putrescine and spermidine were observed. The amount of ornithine decarboxylase in DR112(pSAMDC) was approximately 30% less than that in DR112. In addition, S-adenosylmethionine decarboxylase activity was strongly inhibited by spermidine. A possible regulatory mechanism to maintain polyamine contents in Escherichia coli is discussed based on the results.

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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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