Abstract
Two cell clones were isolated from the simian line CV1, permissive for simian virus 40 (SV40), by selection at low temperature with the tsA239 mutant of SV40. These clones exhibited cold-sensitive semipermissivity to both SV40 virions and SV40 DNA. On the basis of virus yields, their resistance to viral DNA was increased approximately 15 times over that of CV1 cells when the incubation temperature was lowered from 38.5 to 33.5 degrees C. A further 30- to 40-fold resistance increase was exhibited at both temperatures upon infection with SV40 virions. Partial characterization of these clones indicated that the cold sensitivity affected an early function in viral growth, between viral uncoating and the appearance of T-antigen positivity, with a burst-size decrease in all cells at the restricted temperature. This conditional defect appeared to be superimposed upon a temperature-independent uncoating defect, presumably carried in a CV1 subpopulation from which the two clones were ultimately selected.
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Selected References
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