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. 1975 May;122(2):610–622. doi: 10.1128/jb.122.2.610-622.1975

Fate of heterologous deoxyribonucleic acid in Bacillus subtilis.

M Piechowska, A Soltyk, D Shugar
PMCID: PMC246099  PMID: 805125

Abstract

CsCl density gradient fractionation of cell lysates was employed to follow the fate of Escherichia coli, phage T6, and non-glucosylated phage T6 deoxyribonucleic acid (DNA) after uptake by competent cells of Bacillus subtilis 168 thy minus trp minus. Shortly after uptake, most of the radioactive Escherichia coli or non-glucosylated T6 DNA was found in the denatured form; the remainder of the label was associated with recipient DNA. Incubation of the cells after DNA uptake led to the disappearance of denatured donor DNA and to an increase in the amount of donor label associated with recipient DNA. These findings are analogous to those previously reported with homologous DNA. By contrast, T6 DNA, which is poorly taken up, appeared in the native form shortly after uptake and was degraded on subsequent incubation. The nature of the heterologous DNA fragments associated with recipient DNA was investigated with Escherichia coli 2-H and 3-H-labeled DNA. Association of radioactivity with recipient DNA decreased to one-fourth in the presence of excess thymidine; residual radioactivity could not be separated from recipient DNA by shearing (sonic oscillation) and/or denaturation, but was reduced by one-half in the presence of a DNA replication inhibitor. Residual radioactivity associated with donor DNA under these conditions was about 5% of that originally taken up. Excess thymidine, but not the DNA replication inhibitor, also decreased association of homologous DNA label with recipient DNA; but, even in the presence of both of these, the decrease amounted to only 60%. It is concluded that most, or all, of the Escherichia coli DNA label taken up is associated with recipient DNA in the form of mononucleotides via DNA replication.

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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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