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. 1976 Sep;19(3):801–809. doi: 10.1128/jvi.19.3.801-809.1976

Thymidine metabolism and DNA synthesis in Newcastle disease virus-infected cells.

R Hand
PMCID: PMC354921  PMID: 972433

Abstract

The inhibition of thymidine incorporation into DNA in Newcastle disease virus-infected cells has been studied. At 6 h after infection of L-929 cells at high multiplicity, transport of exogenous thymidine across the cell membrane was inhibited. The kinetics of this inhibition, decreased Vmax with no change in Km, suggest that there are fewer sites available for transport in infected cells. The conversion of thymidine to dTTP was not inhibited. Equilibrium of exogenous thymidine with the acid-soluble pool occurred more slowly and at a lower level of radioactivity than in uninfected cells, and there was a reduction in the rate of incorporation of exogenous thymidine into DNA. The reduction of incorporation into the pool and into DNA was proportionate. The size of total cellular dTTP pools was changed very little in infected cells. DNA synthesized in infected cells in the presence of [3H]BrdUrd had reduced incorporation of tritium but similar buoyant density to that from uninfected cells. The results show that Newcastle disease virus inhibits DNA synthesis directly and, in addition, decreases thymidine transport. Together these account for the overall decrease in thymidine incorporation into DNA of infected cells.

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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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