Stimulation of deoxyribonucleic acid replication fork movement by spermidine analogs in polyamine-deficient Escherichia coli - PubMed

Stimulation of deoxyribonucleic acid replication fork movement by spermidine analogs in polyamine-deficient Escherichia coli

L E Geiger et al. J Bacteriol. 1980 Mar.

Abstract

We examined the rate of deoxyribonucleic acid (DNA) replication fork movement in polyamine-deficient cells of Escherichia coli by two independent techniques. DNA autoradiography was used to directly visualize the length of DNA produced during a given time interval, and replication rates were calculated. The amount of DNA synthesized after blocking protein synthesis also allowed calculation of replication rates. We found that the DNA chain elongation rate in polyamine-deficient cells was about half that of putrescine- or spermidine-supplemented cells. We also found that spermidine homologs of increasing chain length, when present at equal intracellular concentrations, exhibited a decreasing ability to support growth and the rate of DNA replication fork movement. The kinetics of recovery of DNA synthesis from the polyamine-deficient state were also investigated. A new rate of DNA synthesis was reached about 20 min after addition of spermidine to polyamine-limited cells. The rise in the rate of DNA synthesis was preceded by a rise in the intracellular concentration of spermidine.

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