1887

Abstract

Three groups of lysine-excreting, thialysine-resistant mutants of were derived from the wild-type strain (X2180) by mutagenic treatment and selected on the basis of a cross-feeding assay. Mutants MNNG2-9, MNNG2-27, MNNG2-39 and MNNG2-62 (group I) exhibited a 2:2 segregation for thialysine resistance following mating with a wild-type strain and a lower than wild-type lysyl-tRNA synthetase activity; the thialysine-resistant phenotype was dominant in specific hybrids. Mutant MNNG2-2 (group II) was similar to group I mutants except that the thialysine-resistant phenotype was recessive in the hybrid. Mutant MNNG3-142 (group III) exhibited an irregular ratio of segregation of thialysine resistance and a significantly lower lysyl-tRNA synthetase activity; the thialysine-resistant phenotype was recessive in the hybrid. The growth of both group I and group III mutants was temperature-sensitive. The thialysine-resistant mutants exhibited pleiotropic properties including the increased production and excretion of lysine, thermosensitive growth and an impairment of lysyl-tRNA synthetase activity.

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1981-02-01
2021-05-18
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