Abstract
Uracil auxotrophs of Sulfolobus acidocaldarius were positively selected by using 5-fluoroorotic acid. The wild-type strain was unable to grow in medium containing 5-fluoroorotic acid, whereas the mutants grew normally. Positive selection could be done for the auxotrophs. Mutants deficient in orotidine-5'-monophosphate pyrophosphorylase activity were isolated.
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