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. 1976 Jul;19(1):26–35. doi: 10.1128/jvi.19.1.26-35.1976

Behavior of a temperate bacteriophage in differentiating cells of Bacillus subtilis.

M S Osburne, A L Sonenshein
PMCID: PMC354829  PMID: 820875

Abstract

During the first 6 hr of sporulation, infection of Bacillus subtilis by by phi105 wild type or the clear-plaque mutant phi105 c30 was nonproductive, but phage DNA was trapped inside developing spores. After infection with either wild-type or mutant phage at early times of sporulation (T1-T3), phage DNA entered the developing spores in a heat-stable form, which may represent integration of the phage DNA into the host chromosome. Phage DNA in carrier spores produced by infection at later times (T4-T6) was much more heat sensitive. Spore preparations containing either phi105 wild type or phi105 c30 carrier spores gave rise to a spontaneous burst of phage during outgrowth, although the fraction of carried wild-type phage that chose lysis over lysogeny at germination has not been determined. Heat induction of the thermoinducible lysogen 3610 (phi105 cts23) was also abortive during sporulation. Furthermore, induction neither prevented eventual spore formation nor resulted in the conversion of prophage DNA to the carrier state; during outgrowth, the previously induced lysogenic spores remained stable lysogens. However, if the sporulating lysogenic cells were plated immediately after induction, they did not form colonies at high efficiency, as though transfer to fresh medium allowed sufficient phage expression to kill the host.

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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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