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. 1983 Aug;3(8):1403–1411. doi: 10.1128/mcb.3.8.1403

Accommodation of pyrimidine dimers during replication of UV-damaged simian virus 40 DNA.

P C Stacks, J H White, K Dixon
PMCID: PMC369986  PMID: 6621531

Abstract

UV irradiation of simian virus 40-infected cells at fluences between 20 and 60 J/m2, which yield one to three pyrimidine dimers per simian virus 40 genome, leads to a fluence-dependent progressive decrease in simian virus 40 DNA replication as assayed by incorporation of [3H]deoxyribosylthymine into viral DNA. We used a variety of biochemical and biophysical techniques to show that this decrease is due to a block in the progression of replicative-intermediate molecules to completed form I molecules, with a concomitant decrease in the entry of molecules into the replicating pool. Despite this UV-induced inhibition of replication, some pyrimidine dimer-containing molecules become fully replicated after UV irradiation. The fraction of completed molecules containing dimers goes up with time such that by 3 h after a UV fluence of 40 J/m2, more than 50% of completed molecules contain pyrimidine dimers. We postulate that the cellular replication machinery can accommodate limited amounts of UV-induced damage and that the progressive decrease in simian virus 40 DNA synthesis after UV irradiation is due to the accumulation in the replication pool of blocked molecules containing levels of damage greater than that which can be tolerated.

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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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