Summary
We have demonstrated previously by DNA-DNA hybridization that induction of λ phage with wild type O and P genes results in an increase of bacterial DNA in the chromosomal region adjacent to the left of the prophage, that is a segment between gal and att λ (gal DNA) (Imae and Fukasawa, 1970). Evidence is presented in this report that such an increase of bacterial DNA is also seen in the region to the right of the prophage; a segment between bio and att λ (bio DNA). We postulate therefore that the bidirectional replication of λ DNA extends beyond the prophage and copies the neighboring host DNA until the prophage is excised. The model is verified by making use of excision-defective λ phages. The synthesis of gal DNA (or bio DNA) slows down to a halt within 40 min after the induction in the normal lysogens. The results are attributed to the prophage excision: (1) In lysogens for λint, synthesis of the bacterial DNA continues for longer times. (2) The synthesis of the bacterial DNA slows down to a halt in lysogens for λxis or λb2 as in the control. However λ DNA synthesis also slows down in parallel so that the amount of the bacterial DNA relative to that of λ DNA synthesized by a given time stays constant from 20 min to 80 min. During that time the relative amount of the bacterial DNA rapidly decreases in the normal lysogen.
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Communicated by W. Arber
The first article of this series is in J. molec. Biol. 54, 585 (1970).
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Hirai, K., Fukasawa, T. Regional replication of the bacterial chromosome induced by derepression of prophage lambda. Molec. gen. Genet. 147, 71–78 (1976). https://doi.org/10.1007/BF00337938
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DOI: https://doi.org/10.1007/BF00337938