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

Journal Article · Mon Aug 01 00:00:00 EDT 1983 · Mol. Cell. Biol.; (United States)

DOI:https://doi.org/10.1128/MCB.3.8.1403· OSTI ID:6748349

Stacks, P C; White, J H; Dixon, K

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.

• OSTI ID: 6748349
• Journal Information: Mol. Cell. Biol.; (United States), Vol. 3:8
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
DNA REPLICATION
INHIBITION
SIMIAN VIRUS
TOLERANCE
ULTRAVIOLET RADIATION
BIOLOGICAL EFFECTS
CELL CULTURES
DIMERS
LABELLED COMPOUNDS
PYRIMIDINES
THYMINE
TRACER TECHNIQUES
TRITIUM COMPOUNDS
AZINES
ELECTROMAGNETIC RADIATION
HETEROCYCLIC COMPOUNDS
HYDROXY COMPOUNDS
ISOTOPE APPLICATIONS
MICROORGANISMS
NUCLEIC ACID REPLICATION
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PARASITES
RADIATIONS
URACILS
VIRUSES
560301* - Chemicals Metabolism & Toxicology- Cells- (-1987)