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We have mapped the temperature-sensitive (ts) lesions of three mutants, ts51, ts53, and ts65, and two other mutants, ts7 and ts20, to regions on the vaccinia virus genome that encode the 147- and 22-kilodalton subunits of the viral DNA-dependent RNA polymerase, respectively. Plasmid and bacteriophage clones from the HindIII J region and the region spanning the HindIII J-H junction were used in marker rescue experiments to map the mutations. Sequence analysis of the region encoding the 22-kilodalton subunit in the wild-type, ts7, and ts20 viruses revealed a single base change in the mutants compared with that in the wild-type virus. The identification of these RNA polymerase mutants provides us with tools to understand transcription and its regulation in vaccinia virus.

Fine structure mapping of five temperature-sensitive mutants in the 22- and 147-kilodalton subunits of vaccinia virus DNA-dependent RNA polymerase