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. 1974 Nov;120(2):917–922. doi: 10.1128/jb.120.2.917-922.1974

Acid-Soluble Breakdown of Homologous Deoxyribonucleic Acid Adsorbed by Haemophilus influenzae: Its Biological Significance

Johan H Stuy 1
PMCID: PMC245857  PMID: 4549063

Abstract

Competent bacteria of Haemophilus influenzae strain Rd were exposed to various kinds of radioactive deoxyribonucleic acid (DNA) for short periods of time and at relatively low temperature. The fate of phage HP1 DNA was studied most extensively. Adsorbed DNA was partially acid solubilized by lysogens and by nonlysogens with very similar kinetics. The biological activity of the DNA decreased extensively in both lysogenic and nonlysogenic recipients. 2,4-Dinitrophenol had no effect on the acid solubilization but largely abolished the biological inactivation. Inactivation kinetics for three different markers and for the triple combination were roughly the same. The presence of 2,4-dinitrophenol in the medium, or the HP1 prophage in the chromosome, did not alter this observation. This suggests that acid solubilization involves the destruction of whole DNA molecules. In view of the absence of DNA homology between phage and host, it is concluded that acid-soluble breakdown of adsorbed transforming DNA is not an integral part of the donor DNA integration process. Behavior of mutant bacteria indicates that neither exonuclease III nor exonuclease V is involved.

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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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