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. 1976 Nov;128(2):540–548. doi: 10.1128/jb.128.2.540-548.1976

Size and transforming activity of deoxyribonucleic acid in Diplococcus pneumoniae during thymidine starvation.

J L Bousque, N Sicard
PMCID: PMC232789  PMID: 10277

Abstract

The transforming activity and the molecular structure of DNA from cells of Diplococcus pneumoniae during thymidine starvation have been analyzed and the effects of thymidine starvation have been compared with the effects of single-strand breaks produced by deoxyribonucleases in DNA of unstarved cells. The decrease in transforming activity of lysates from starved cells as a function of the size of DNA particles, measured by centrifugation in neutral and alkaline sucrose gradients, does not follow the kinetics observed after enzymatic degradation of DNA of unstarved cells. Moreover, a strain lacking exo- and endonuclease activities is not protected from thymineless death. These results suggest that the basic lethal mechanism of thymidine starvation might have an origin other than the activation of nucleases.

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Selected References

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