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. 1977 Feb;129(2):916–925. doi: 10.1128/jb.129.2.916-925.1977

Spermidine-Deoxyribonucleic acid interaction in vitro and in Escherichia coli.

R L Rubin
PMCID: PMC235030  PMID: 320196

Abstract

The binding of spermidine to deoxyribonucleic acid (DNA) was studied by equilibrium dialysis in a wide range of salt concentrations. The association constants ranged from 6 x 10(5) M-1 in 1 mM sodium cacodylate, pH 7.5, to 3 x 10(2) M-1 in 0.3 M NaCl. MgCl2 reduced spermidine-DNA interaction even more than NaCl so that in moderate-ionic-strength solutions (0.3 M NaCl, 0.002 M MgCl2) there was little detectable binding. Low-ionic-strength media were used to isolate DNA from Escherichia coli by a method shown to minimize loss of spermidine from the DNA. Considerable spermidine was associated with E. coli DNA, but control experiments indicated that complex formation had taken place during or after lysis of the cells. Exogenous DNA or ribonucleic acid added to spheroplasts at the time of their lysis caused most of the cellular spermidine to be scavenged by the extra nucleic acid. The data suggest that spermidine is relatively free in the cell and thereby capable of strong (high-affinity) associations with nucleic acids only after the ionic strength of the cell environment is lowered.

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Selected References

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