title: Synchronous replication of SV 40 DNA in virus infected TC 7 cells induced by transient hypoxia.
abstract: We transiently exposed SV 40 infected TC 7 cell cultures to a reduced O2 tension (4-8 h, about 200 ppm relative to 10(5) Pa total pressure). Under the hypoxic conditions, 'working' viral replication forks were greatly retarded or stopped, and initiation of daughter strand synthesis in further SV 40 DNA molecules was suppressed. Reoxygenation released an immediate burst of SV 40 replication which mainly consisted of a synchronous viral replication round. This synchronous in vivo replication began at the known origin of replication and proceeded at normal rates to the known termination region. Viral replicons seemed to accumulate under hypoxia in a state fully prepared to begin replication immediately after recovery of a normal pO2. The shut-down and sudden reactivation of DNA synthesis under hypoxia and reoxygenation, respectively, were not accompanied by changes of the phosphorylation state of large T antigen. The described synchronization procedure can be applied to optionally large SV 40 infected cell cultures.
authors.affiliation: Physiologisch-chemisches Institut der Universität Tübingen, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Dreier
authors.forename: K H
authors.initials: KH
authors.lastname: Scheidtmann
authors.forename: H
authors.initials: H
authors.lastname: Probst
mesh_terms: D000818:Animals; D000952:Antigens, Polyomavirus Transforming / Q000096:biosynthesis / Q000378:metabolism; D015687:Cell Hypoxia; D002460:Cell Line; D002522:Chlorocebus aethiops; D002999:Clone Cells; D004261:DNA Replication; D004279:DNA, Viral / Q000096:biosynthesis* / Q000302:isolation & purification; D007700:Kinetics; D010710:Phosphates / Q000378:metabolism; D010748:Phosphopeptides / Q000032:analysis; D013539:Simian virus 40 / Q000235:genetics*; D013936:Thymidine / Q000378:metabolism; D013997:Time Factors; D014316:Tritium
chemical_list: D000952:Antigens, Polyomavirus Transforming; D004279:DNA, Viral; D010710:Phosphates; D010748:Phosphopeptides; D014316:Tritium; D013936:Thymidine