Cell preparations of L1, S743, BTS-39, 23-6, S6, and G230 were examined for 13 cytoplasmic enzyme activities involved in the salvage and interconversion of nucleobases, nucleosides, and 5″-mononucleotides. The unique pyrophosphate-dependent nucleoside kinase activity known only in B-PG9 was found in and . All the organisms could be divided into three groups based upon their patterns of purine salvage and interconversion activities. All the tested organisms, , and apparently subsp. lack the ability to synthesize guanylates from other purine mononucleotides, indicating that these members of the class can only salvage guanylates. The plant epiphytes and had an identical purine enzyme pattern which was different from those of all other members of the studied.


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