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The incorporation of (3)H-labeled thymidine triphosphate ((3)H-dTTP) into deoxyribonucleic acid (DNA) of germinated and then Brij 58-treated Bacillus subtilis spores was measured to study DNA replication activity of cells. The dTTP incorporation rate was very low in dormant spores, gradually increased as germination proceeded, and reached a level of the vegetative cell activity approximately 4 hr after the start of germination. This is in contrast to the DNA polymerase activity in the cell extract which remained at the same level throughout the germination period. The increase of the dTTP incorporation activity was inhibited by chloramphenicol or phenethyl alcohol. When these inhibitors were added after germination had proceeded, the elevated dTTP incorporation activity gradually decreased. Permeability to dTTP of spores germinated in the presence of chloramphenicol and then treated with Brij 58 was confirmed by (i) (3)H-dTTP incorporation into the treated spores following either electron or ultraviolet irradiation and (ii) release of radioactivity from the treated spores containing radioactively labeled DNA after deoxyribonuclease I treatment.

journal of bacteriology

Increasing Activity of Germinating <i>Bacillus subtilis</i> Spores to Incorporate Thymidine Triphosphate into Deoxyribonucleic Acid After Detergent Treatment

Increasing Activity of Germinating Bacillus subtilis Spores to Incorporate Thymidine Triphosphate into Deoxyribonucleic Acid After Detergent Treatment