Abstract
Host DNA synthesis stopped about 10 min after the infection of Pseudomonas acidovorans with bacteriophage phi W-14, but host DNA was not degraded to acid-soluble fragments. The synthesis of host but not of phage DNA was inhibited by 5-fluorodeoxyuridine. The nucleotide pools of infected cells did not contain dTTP, and infection resulted in the appearance of dTTPase activity. Although ornithine labeled the alpha-putrescinylthymine residues of phi W-14 DNA, ornithine-labeled nucleotides were not detected in infected cells. A new deoxynucleoside triphosphate did appear in infected cells, but it was not labeled by ornithine. It is concluded that the thymine and alpha-putrescinylthymine in phi W-14 DNA are synthesized at the polynucleotide level.
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