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Inactivation of T Antigen-Forming Capacities of Simian Virus 40 and Adenovirus 12 by Ultraviolet Irradiation

^a Department of Enteroviruses, National Institute of Health, Musashimurayama, Tokyo, 190-12, Japan

ABSTRACT

Methods to measure T antigen-forming capacities of simian virus 40 (SV40) and adenovirus 12 (Ad12) were investigated, and a method to measure the capacity in terms of T antigen-forming units was employed by the use of cytosine arabinoside. Plaque-forming units and T antigen-forming units of SV40, SV40 deoxyribonucleic acid, or Ad12 were inactivated by ultraviolet (UV) irradiation at the same rate, roughly following a single-hit curve. T-antigen formation by UV-irradiated SV40 and Ad12 was enhanced in cells multiply infected and in cells in a growing state. These observations showed that it was difficult or impossible to estimate the size of the gene for T antigen by UV inactivation.

¹ Present address: The Institute of Medical Science, P.O. Takanawa, Tokyo, 108, Japan.